Columbia is a planned community comprising 10 self-contained villages, located in Howard County, Maryland —the second wealthiest county in the United States, according to 2013 U.S. Census Bureau figures. It began with the idea that a city could enhance its residents' quality of life. Creator and developer James W. Rouse saw the new community in terms of human values, rather than merely economics and engineering. Opened in 1967, Columbia was intended to not only eliminate the inconveniences of then-current subdivision design, but additionally eliminate racial, religious, and class segregation.
Columbia proper consists only of that territory governed by the Columbia Association, but larger areas are included under its name by the U.S. Postal Service and the Census Bureau. These include several additional communities which predate Columbia, including Simpsonville, Atholton, and in the case of the census, part of Clarksville. The census-designated place had a population of 103,683 according to 2013 Census estimates, making it the most populous community in Maryland after Baltimore. 
Columbia's origins come from a crossroads in eastern Howard County formed by the Columbia Turnpike Road Company when it built a road from the Montgomery Courthouse to Baltimore called the "Columbia Road", now known as U.S. Route 29. A small post office at the crossroads of the turnpike and Old Annapolis Road (present-day MD 108) named "Columbia" opened on August 27, 1874, serving a population of 20 residents as late as 1912.   Developer and community associations prefer to acknowledge the completion of the first council estate in the 1960s as the foundation of "Columbia".
In 1932 Melvin J. Berman moved from Alabama to Howard County where he bought the Olney Acres dairy farm. Starting his own land development company, he built the Laurel Shopping Center, and later joined the shopping centre development company, Community Research and Development, along with James Rouse. In 1961 Berman pursued his own Howard County for the company's next development. In 1962 Berman took interest in a 1,032-acre (418 ha) parcel of land assembled by land developer Robert Moxley comprising four farm properties from the Carroll, Kahler, Wix, and his uncle James R. Moxley Sr's families. Close to 15,000 acres (6,100 ha) were desired to create a parcel large enough for an envisioned 100,000-person development.
Jack Jones, an attorney from Rouse's firm of Piper Marbury set up a grid system to secretly buy land through dummy corporations like the "Alaska Iron Mines Company" to keep costs low. Some of these included Howard Research and Development Corporation, Columbia Industrial Development Corporation, 95-32 Corporation, 95-216 Corporation, Premble, Inc., Columbia Mall, Inc., Oakland Ridge Industrial Development Corporation, and Columbia Development Corporation. Moxley's firm Security Realty Company (now Security Development Group Inc), negotiated most of the land deals for Jones, fitting his best client.  CRD accumulated 14,178 acres (57.38 km 2 ), 10 percent of Howard County, from 140 separate owners. Rouse was turned down in financing from David Rockefeller, who recently cancelled a planned Rouse "Village" concept Pocantico Hills.  The $19,122,622 acquisition was then funded by Rouse's former employer Connecticut General Life Insurance in October 1962 at an average price of $1,500 per acre ($0.37/m²). The town centre land of Oakland Manor was purchased from Isadore Guldesky who was turned down from building high-rises on the site by Rob Moxley's brother, County Commissioner and land developer Norman E. Moxley. Sensing that he had a key property, he requested $5 million for his 1000 acres, signing an agreement by hand on a land plat.  The competition between Rouse and Guldesky carried over to the competing Tysons Corner Center and Tysons Galleria projects with each additional hiring their competitor's employees. 
By late 1962, citizens had elected an all-Republican three-member council. J. Hubert Black, Charles E. Miller, and David W. Force campaigned on a slow-growth ballot, but later approved the Columbia project.  The Howard County Planning Commission Chairman Wilmer Sanner declared, "if this adds to the orderly development of the county, that's what we're looking for." That July Sanner sold the majority of his 73-acre (30 ha) Simpsonville farm to Howard Research prior to the public announcement.  In October 1963, the acquisition was revealed to the residents of Howard County, putting to rest rumours about the mysterious purchases. These had included theories that the site was to become a medical research laboratory or a giant compost heap. Despite the moniker of being a "planned city" the planning for the city occupied Rouse officials for most of 1964 after the announcement while marketing director Scott Ditch was brought from the Cross Keys development to promote the project to community groups. 
In December 1964 the zoning was rejected by the planning director Tom Harris Jr. for handing nearly all planning control to the developer. A media push was instituted to approve the zoning by Dorris Thompson of The Howard County Times, Seymour Barondes of the Howard County Civic Association, and Anita Iribe of the League of Women Voters.  In June 1965 zoning was approved for the project, and Howard Research and Development entered into a $37.5 million construction deed backed by the property.   Development was temporarily stalled in October 1965 when James and Anna Hepding of Simpsonville sued the planning board stating New Town zoning was a form of Spot zoning benefiting a sole property owner. The case was dropped when developer Homer Gudelsky purchased the estate.  Ten years later, Councilman Charles E. Miller stated that if he could do it over again, he wouldn't have approved Columbia. He felt exploited and felt the subsidised housing would become a problem for the rest of the county. 
At this unveiling on 21 June 1967 James Rouse described Columbia as a planned new city which would avoid the leap-frog and spot development threatening the county. The new city would be complete with jobs, schools, shopping, and medical services, and a range of housing choices. Property taxes from commercial development would cover the additional services with which housing would burden the county. The urban planning process for Columbia included not only planners, but additionally a convened panel of nationally recognised experts in the social sciences, known as the Work Group. The fourteen member group of white men and one woman, Antonia Handler Chayes met for two days, twice a month, for half a year starting in 1963.  The Work Group suggested innovations for planners in education, recreation, religion, and health care, as well as ways of improving social interactions. Columbia's open classrooms, interfaith centers, and the then-novel idea of a health maintenance organization (HMO) with a group practise of medical doctors (the Columbia Medical Plan) sprung from these meetings. The community's physical plan, with neighbourhood and village centers, was additionally decided. Columbia's "New Town District" zoning ordinance gave developers great flexibility about what to put where, without requiring county approval for each specific project.
In 1968, Vice Presidential candidate, Spiro Agnew referenced Columbia to reporters "Government should act as a catalyst to encourage the local governments to encourage industry and business to move next to a planned community", "I want to lessen the density in the ghettos, and concurrently rebuild the ghetto areas".  In 1969, County Executive Omar J. Jones felt that the increase in tax base was lagging behind the need for infrastructure as the operating budget doubled to $15 million in three years. Crime rates shot up around the county by 30-50% a year, with hot spots around the development.   By 1970, the project required additional financing to continue, borrowing $30 million from Connecticut General, Manufacturers Hanover Trust, and Morgan Guaranty. In 1972, amendments to New Town zoning were proposed to place a maximum height for buildings and maintain the original density limit of 2.2 units per acre were opposed by Rouse allies including the Columbia Association, Ellicott City Businessman's Association and Columbia Democratic Club.  By 1974, the amount owed reached $100,000 million, prompting partner Connecticut General to consider bankruptcy. An effort to create a special taxing district in 1978 and an effort to incorporate with a mayor in 1979 failed.  In 1985 CIGNA (Connecticut General) divested itself of the project for $120 million. By 1990 Howard Research and Development owed $125,162,689.00  >  In 2004 the project was sold to General Growth Properties which went bankrupt in 2008. General Growth Properties submitted a plan for increasing density throughout Columbia in 2004 which was unanimously voted down.  Ownership of the project fell to the previous Rouse subsidiary The Howard Hughes Corporation. Howard Hughes submitted a new plan to increase density in 2010 under the Ulman administration that passed unanimously.
Columbia was never incorporated ; a few governance, however, is provided by the non-profit Columbia Association, which manages common areas and functions as a homeowner association with regard to private property. The first boards were filled entirely with Rouse Company appointees. The first manager of the Columbia Association was John Estabrook Slayton (d. 1967). For Slayton's contributions to the early planning of Columbia, the community centre in the Wilde Lake village, Slayton House, was named for him. Wilde Lake was the first village area to be developed in Columbia; accordingly, the town's first high school was Wilde Lake High School, which opened in 1971 as a "model school for the nation". Constructed in the open classroom style, it was razed in 1994 but reconstructed on the same site in 1996.
Two historic buildings in Columbia, Dorsey Hall and Woodlawn, were listed on the National Register of Historic Places in 1973.  Both were once homes of prominent Howard County citizens. Most historic buildings, mills and plantations within Columbia that qualified for the register, like Oakland Manor,  weren't submitted by Rouse company affiliates.
To achieve the goals set forth by the Work Group, Columbia's Master Plan called for a series of ten self-contained villages, around which day-to-day life would revolve. The centrepiece of Columbia would be The Mall in Columbia and man-made Lake Kittamaqundi.
Villages and neighborhoods
The village concept aimed to provide Columbia a small-town feel (like Easton, Maryland, where James Rouse grew up). Each village comprises several neighborhoods. The village centre might contain middle and high schools. All villages have a shopping center, recreational facilities, a community center, a system of bike/walking paths, and homes. Four of the villages have interfaith centers, common worship facilities which are owned and jointly operated by a variety of religious congregations working together.
Most of Columbia's neighbourhoods contain single-family homes, townhomes, condominiums and apartments, though a few are more exclusive than others. The original plan, following the neighbourhood concept of Clarence Perry, would have had all the children of a neighbourhood attend the same school, melding neighbourhoods into a community and ensuring that all of Columbia's children get the same high-quality education. Rouse marketed the city as being "color blind" as a proponent of Senator Clark's fair housing legislation. If a neighbourhood was filled with too a large number of purchasers of a single race, houses would be blocked until the desired ratio was met. 
- Village – Neighborhoods (in order of residential opening)
- Wilde Lake – (Est. 1967) Bryant Woods, Faulkner Ridge, Running Brook, The Birches
- Harper's Choice – Longfellow, Swansfield, Hobbit's Glen
- Oakland Mills – (Est. 1969) Thunder Hill, Talbott Springs, Stevens Forest
- Long Reach – (Est. 1971) Phelps Luck, Jeffers Hill, Locust Park, Kendall Ridge
- Owen Brown – (Est. 1972) Dasher Green, Elkhorn, Hopewell
- Town Center – (Est. 1974) Vantage Point, Banneker, Amesbury, Creighton's Run, and Warfield Triangle
- Hickory Ridge – (Est. 1974) Clemens Crossing, Hawthorn, Clary's Forest
- Kings Contrivance – (Est. 1977) Dickinson, Huntington, Macgill's Common
- Dorsey's Search – (Est. 1980) Dorsey Hall, Fairway Hills
- River Hill – (Est. 1990) Pheasant Ridge, Pointers Run
Columbia takes its street names from famous works of art and literature: for example, the neighbourhood of Hobbit's Glen takes its street names from the work of J. R. R. Tolkien ; Running Brook, from the poetry of Robert Frost ; and Clemens Crossing, from the work of Mark Twain. The book Oh, you must live in Columbia! chronicles the artistic, poetic, and historical origins of the street and place names in Columbia. 
In 2006, Money magazine ranked Columbia (together with Ellicott City, its neighbour to the north) #4 out of the 100 "Best Places to Live" in the United States.  In 2008, Columbia and Ellicott City were ranked #8 on this list.  In 2010, Columbia and Ellicott City were ranked #2 on this list.  In 2012 and 2014, Columbia and Ellicott City were ranked, respectively, #8 and #6 on this list.  
"The Downtown Columbia Plan" is a 2010 amendment to the county's General Plan of expansion. It is a framework for the revitalization of Downtown Columbia over the next thirty years. Development plans for downtown projects in the years ahead will include details for that project like neighbourhood design guidelines, environmental restoration, public amenities and infrastructure. These development plans must adhere to the framework of the Downtown Columbia Plan as required by the zoning legislation. Over the life of the Downtown Columbia development project, as much as 13 million square feet of retail, commercial, residential, hotel and cultural development is planned.  To be accomplished in three phases, the plan calls for:
The formation of the non-profit Columbia Downtown Housing Corporation to build an additional 5,500 units of low income housing placed downtown in exchange for increased zoning density for additional projects.  Additional development includes 4.3 million square feet of commercial office space, 1.25 million square feet of retail space, 640 hotel rooms, Merriweather Post Pavilion redevelopment and a multi-modal transportation system. 
The Downtown Columbia Plan additionally has sustainability features, including goals for saving water and energy, and for ecology and livability.
The centre of Columbia is located at United States Census Bureau, which has a total area of 32.2 square miles (83.4 km 2 ), of which 31.9 square miles (82.7 km 2 ) is land and 0.27 square miles (0.7 km 2 ) of it (0.80%) is water.  The CDP includes a number of older communities which don't lie within the CA's purview, including the Holiday Hills, Diamondback, and Allview subdivisions and the former town of Simpsonville, as well as a few land on the east side of Clarksville. These areas aren't part of the "new town", and aren't directly served by its amenities. Some of these areas are included in Columbia ZIP codes by the post office, and a few are not.. Notwithstanding because it is unincorporated, there's confusion over its exact limits. In the strictest definition, Columbia comprises only the land governed under covenants by the Columbia Association. This is a considerably smaller area than the census-designated place (CDP) as defined by the
The city lies in the Piedmont region of Maryland, with its eastern edge at the fall line. The climate is that of central Maryland, tending to hot, humid summers and cool to cold and wet winters. The primary landforms in Columbia are rolling hills and stream valleys; Columbia's road network is laid out to follow the terrain, with a large number of winding streets and cul-de-sacs. Elevations range from about 200 to 500 feet (61 to 152 m) above sea level. Most of Columbia is drained by the Middle Patuxent and Little Patuxent rivers. There are three artificial lakes, created by damming of tributary streams throughout city construction. In 1965, the Rouse Company leased 7,000 acres (2,800 ha) of farmland staged for development, and earmarked 4,000 acres (1,600 ha) of oak forest for timber harvesting. The company developed a sapling planter to replant sections of cleared land that would use Columbia's W.R. Grace developed fertilizers.  A outer ring of green-space was abandoned early in the project because the combination with the already required river buffers would have reduced profitable land available for building.  Along with Symphony Woods, a large number of additional stands of mature trees have been temporarily maintained in Columbia, including the large Middle Patuxent Environmental Area in the western part of the city between Harper's Choice and River Hill villages, protecting much of the river valley from development.
Rouse believed that individual churches were a waste of developable land. Dr. Stanley Hallet advised the 1964 work group to economically abandon "The extravagance of church life" in favour of ecumenical establishments that focused resources on retreat centres and non-profit religious corporations.  The Rouse company discouraged individual congregations from purchasing land from the company. In 1966 the Columbia Religious Facilities Corporation was founded to lease interfaith centres to congregations.   On 22 June 1969 $2.5 million in church donations applied to the CFRC to purchase Columbia land and build an interfaith facility in Wilde Lake. The organisation formed the Interfaith Housing Corporation (now the Columbia Housing Corporation) to purchase 300 units of low and moderate income housing in the development with Federal Housing Authority funding.
Recreation has always been an important part of the Columbia concept. The homeowners association, the Columbia Association, known to Columbians as "CA," builds, operates and maintains most of these facilities. CA operates a variety of recreational facilities, including 23 outdoor swimming pools, six indoor pools, two water slides, ice and roller skating rinks, an equestrian center, a sports park with miniature golf, a skateboard park, batting cages, picnic pavilions, clubhouse and playground, three athletic clubs including the 24/7 Supreme Sports Club, numerous indoor and outdoor tennis, basketball, volleyball, squash and racquetball courts, and running tracks. In February 2006 LifeTime Fitness (a Minnesota company) opened a 24/7 health club at the edge of the Columbia Gateway industrial park. This facility includes one outdoor and two indoor pools (with water slides), racquetball courts, basketball courts, fitness equipment, and pilates and yoga facilities.
There are three lakes ( Lake Kittamaqundi, Lake Elkhorn, and Wilde Lake) surrounded by parkland for sailing, fishing, and boating ; 80 miles (130 km) of paths for jogging, strolling and biking ; and 148 tot lots and play areas.
Nine village centers, 15 neighbourhood centers, and four senior centers provide space for a large variety of community activities. There are a variety of fairs and celebrations throughout the year, including entertainment on the lakefront of Lake Kittamaqundi throughout the summer and the Columbia Festival of the Arts.
Columbia additionally has garden plots for rent, under the guidance of the Columbia Gardeners, which has been in existence after the 1970s. There are about 350 garden plots at three sites in Columbia, with each garden rented for a nominal fee (currently $30 per year). ( Columbia Flyer , Doug Miller "Turning over a new leaf can be growing concern", May 31, 2007, page 17)
The Rev3 Triathlon is held every October in Columbia. It is a major national event, both half iron and full ironman distances.
In the absence of nightclubs, Columbia relies on local bars to bring in bands. Clyde's (near the Columbia Mall and on Lake Kittamaqundi), Sonoma's (in Owen Brown), along with Nottingham's Tavern and The Green Turtle (near Dobbin Center) regularly bring in groups to perform.
Merriweather Post Pavilion, a well-known outdoor concert venue, attracts a large number of prominent performers. In addition, there are several performing arts organisations that present professional theater, including Toby's Dinner Theatre, which has produced the area premieres of several musicals.
Columbia additionally offers chamber music concerts, children’s programs, community outreach programs, master classes, and pre-concert lectures and discussions through (Candlelight), a non-profit organisation formed by Columbia residents to provide Chamber Music concerts after 1972.
The Mall in Columbia, located in Town Center, is a large regional shopping mall with five anchor department stores ( Nordstrom, Lord & Taylor, Sears, Macy's, and JCPenney), a multiplex movie theater, and more than 200 stores and restaurants.
There are several additional major competing shopping centres in east Columbia, including Dobbin Center strip mall opened in 1983, Snowden Square big box retail on the remainder of the GE industrial site, Columbia Crossing I and II big box retail started in 1997, and Gateway Overlook.
Columbia's nine "village centers" provide residents with nearby shopping as well, most often including supermarkets, gas stations, liquor stores, dry cleaners, restaurants, and hair salons. The village centres are laid out so that individual stores aren't visible from the road, unlike traditional strip malls. The arrangement is criticised because it makes it difficult for newcomers and non-residents to know what shopping is available; it is praised for eliminating much of the garishness of roadside America.
The village centres have evolved over time. The Oakland Mills Village Center had a traditional Village Center layout—stores located off a central corridor—until its demolition in the late 1990s. It has after been replaced with a more traditional strip mall managed by Cedar Realty Trust. The Rouse company abandoned the village centre concept in 2002, selling off the assets to Kimco Realty for $120 million. The Kings Contrivance Village Center underwent major construction in 2007 and 2008 when a new Harris Teeter supermarket was added to the center, but maintained the original character of stores around a central corridor and plaza. Owen Brown village centre is now managed by GFS Realty, and the Long Reach Village centre was declared blighted and purchased by Howard County for resale in 2014. 
James Rouse conceived of a city, not a suburban bedroom community, and a large area on the eastern edge was allocated for industrial purposes. The centrepiece of this aspect of the development was a General Electric appliance plant on a 1,125-acre (4.55 km 2 ) site previously operated as a cattle farm.  After an injunction attempt was blocked in 1969, the plant began operations in 1972 peaking at 2,300 of the predicted 12,000 jobs and was closed in 1990, with all but 21 acres (85,000 m 2 ) of the property being sold back to Howard Research and Development. After toxic waste remediation from onsite sludge dumping, one section was redeveloped for big box retail ; the remainder became the large Gateway Commerce office complex, still being expanded.   In 1968, Bendix Field Engineering moved to a new 143,000 sq foot facility on the historic Woodlawn Plantation where it was used for engineering activity. Howard county purchased the vacant facility creating the Maryland Center for Entrepreneurship in 2011 which relocated to the vacant Patuxent Publishing building in 2014.   There is still a smaller industrial area to the south of this, but by and large East Columbia is dominated by commercial real estate: office, retail, and wholesale in contrast to the original plan, which saw the Town Center area as the commercial centre of Columbia. 
The U.S. federal government is the source of a large number of jobs for Columbians. Several large U.S. Department of Defense installations and R&D facilities surround Columbia, the largest being the National Security Agency at Fort George G. Meade, and the Applied Physics Laboratory, both pre-dating the establishment of Columbia. Companies which have had research facilities in the area include W.R. Grace and Company and Westvaco. Further afield, a large number of Columbians commute to government and government contractor jobs in the Baltimore and Washington, D.C. area.
Companies based in Columbia include W.R. Grace and Company,   Sourcefire, PetMeds, Message Systems, MICROS Systems, Martek Biosciences, Integral Systems, Corporate Office Properties Trust, Shimadzu Scientific Instruments, Inc. and the consumer research company Arbitron. When MaggieMoo's was an independent company, its headquarters was in the Columbia CDP.  
NOTE: The CDP includes considerable areas which aren't part of the planned community.
|Race||Population||% of Total|
|Two or More Races||4,424||4|
|Three or more races||465||< 1%|
|American Indian||393||< 1%|
The 2009-2013 census estimates report the median income for a household in the CDP was $99,877. The per capita income for the CDP was $46,374. About 4.1% of families and 6.6% of the population were below the poverty line, including 8.8% of those under age 18 and 6.4% of those age 65 or over. 
As of the census of 2000, there were 88,254 people, 34,199 households, and 23,118 families residing in the CDP. The population density was 3,202.0 people per square mile (1,236.4/km²). There were 35,281 housing units at an average density of 1,280.0 per square mile (494.3/km²). The racial makeup of the CDP was 66.52% White, 21.47% Black or African American, 0.26% Native American, 7.30% Asian, 0.05% Pacific Islander, 1.63% from other races, and 2.76% from two or more races. 4.12% of the population were Hispanic or Latino of any race. fourteen percent of Columbia's residents were German, eleven percent Irish, ten percent English, five percent Italian, four percent Polish, two percent Russian, two percent Scottish, two percent Indian, two percent Chinese, two percent Korean, two percent Sub-Saharan African, two percent French, and two percent West Indian. 
There were 34,199 households out of which 35.9% had children under the age of 18 living with them, 53.4% were married couples living together, 11.2% had a female householder with no husband present, and 32.4% were non-families. 25.6% of all households were made up of individuals and 5.1% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.09.
In the CDP the population was spread out with 26.3% under the age of 18, 6.7% from 18 to 24, 34.1% from 25 to 44, 25.5% from 45 to 64, and 7.5% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 93.1 males. For every 100 females age 18 and over, there were 88.7 males.
Education and libraries
- Atholton 
- Hammond 
- Howard 
- Long Reach 
- Oakland Mills 
- River Hill 
- Wilde Lake 
Most of these schools additionally serve students from outside Columbia, as is additionally the case with a few middle and elementary schools.
Colleges and universities
There are no conventional four-year colleges or universities in Columbia, but several additional college-level programmes have facilities there. Howard Community College is located near the town center, while the University of Phoenix, American Career Institute, Lincoln College of Technology, Loyola University Maryland, University of Maryland, Baltimore County, Maryland University of Integrative Health, and Johns Hopkins University have facilities on the east side of town at Columbia Gateway Business Park.
In 1966, Howard Community College (HCC) was founded by the Board of Education in Howard County and formally authorised by the Howard County Commissioners Charles E. Miller, J. Hubert Black, and David W. Force. In addition to its original campus in Columbia, it now has satellite campuses in Mount Airy, Laurel, and East Columbia, in the Columbia Gateway Business Park.
Howard County Public Library
Howard County Public Library is consistently top rated among the nation’s public library systems according to Hennen's American Public Library Ratings (HAPLR).  Two of the six branches of the Howard County public library system are in Columbia, including the Central Branch in Town Center and the East Columbia Branch in Owen Brown.
Columbia's initial plan called for a minibus system connecting the village centres on a distinct right-of-way that allowed denser development along the route.  The routes weren't constructed, though minibuses were operated by the Columbia Association under the name ColumBus . These were eventually taken over by Howard County. Six Howard Transit bus routes now serve Columbia and connect it with its neighbouring areas (such as Ellicott City and BWI Airport), while several Maryland Transit Administration (MTA) routes provide access to and from both Washington and Baltimore. MTA weekday commuter bus service connects Columbia to the Washington Metro system. There are no rail stations within Columbia, although the Dorsey MARC Train station is served by Howard Transit buses.
Columbia has a number of roadways that serve the city: U.S. Route 29, Interstate 95, MD 32, MD 108, MD 100, and MD 175. All of these highways allow Columbia access to nearby Baltimore, Washington, D.C. and Annapolis.
Medical care is available at Howard County General Hospital, affiliated with Baltimore's Johns Hopkins Hospital. The Columbia Medical Plan was founded in 1967 as a health maintenance organisation (HMO) available to citizens of Columbia.   In more recent years, however, this plan has divided into separate medical groups that simply share the Twin Knolls buildings. Today, there's a Kaiser Permanente facility located in the Columbia Gateway industrial park. There are additionally a number of clinics, like the Righttime Medical Care centre and Patient First.
Columbia has a humid subtropical climate, with cool winters and hot, muggy summers.
|Climate data for Columbia, MD|
|Average high °F (°C)|| 42 |
| 46 |
| 55 |
| 66 |
| 75 |
| 84 |
| 88 |
| 87 |
| 79 |
| 68 |
| 58 |
| 46 |
| 66.2 |
|Average low °F (°C)|| 25 |
| 27 |
| 35 |
| 44 |
| 55 |
| 64 |
| 69 |
| 68 |
| 60 |
| 48 |
| 38 |
| 29 |
| 46.8 |
|Average precipitation inches (mm)|| 3.16 |
| 3.14 |
| 4.10 |
| 3.81 |
| 4.56 |
| 4.23 |
| 4.05 |
| 3.43 |
| 4.60 |
| 3.98 |
| 4.21 |
| 3.77 |
| 47.04 |
Columbia is a sister city to the planned cities of Cergy-Pontoise, France and Tres Cantos, Spain. Columbia Association International and Multicultural Programs Advisory Committee organises a summer exchange programme for French and Spanish students enrolled in Howard County Public Schools. In 2013, CA announced its new sister city relationship with Tema, a port city in Ghana. The official celebration will be marked with a Ghana Fest on November 17, 2013. They currently only have a friendship agreement with Tema, and an advisory committee is planning to sign the official SCI agreement by 2015. A proposal to add Cap-Haïtien, Hati as a sister city is under consideration. 
The Rouse Company now owned by The Howard Hughes Corporation owns and operates multiple HUD Title VII-New Town planned community developments along with Columbia. These include The Woodlands, Texas, Bridgeland Community, Texas and Summerlin, Nevada. 
- David Adkins,  actor and playwright.
- Stephen Amidon, author, whose 2000 novel, The New City , is set in a fictionalised Columbia in the 1970s
- Bob Beaumont (1932–2011), founder of Citicar, an electric automobile manufacturer from 1974 to 1977. 
- Jayson Blair, disgraced former New York Times reporter
- Zach Brown, linebacker for the NFL's Tennessee Titans
- Michael Chabon, Pulitzer Prize–winning author
- Dan Charnas, journalist and author of "The Big Payback: The History of the Business of Hip-Hop" 
- Frank Cho, creator of Liberty Meadows comic strip
- George Colligan, New York–based jazz pianist
- Cristeta Comerford, White House Executive Chef
- D'Monroe, Broadway and Off-Broadway actor
- Jack Douglass, internet personality on YouTube 
- John Douglas, gridiron football player 
- Mary Downing Hahn, award-winning author of young adult literature
- Kevin Frazier, journalist and TV broadcaster
- Gallant, singer-songwriter
- Tom Green, ultra-runner 
- Greg Hawkes, keyboardist for new wave band The Cars
- David Hobby, professional photographer and author of the Strobist.com lighting blog
- Stephen Hunter, Pulitzer Prize -winning film critic and author
- Kerry G. Johnson, award-winning caricaturist, cartoonist and children's book illustrator
- Ian Jones-Quartey, creator of the webcomic RPG World
- Robert Kolker, author and editor
- Mark Levine, New York City Council member
- Laura Lippman, award-winning mystery author
- Steve Lombardozzi, former professional baseball player
- Steve Lombardozzi, Jr. professional baseball player
- Suzanne Malveaux, CNN reporter
- Aaron Maybin, defensive end for NFL's New York Jets
- Aaron McGruder, animator and cartoonist ( The Boondocks )
- Edward Norton, Academy Award–nominated actor and grandson of James Rouse, made his professional debut at age 8 at Toby's Dinner Theatre in the Town Center
- Randy Pausch, professor of computer science at Carnegie Mellon University, author of The Last Lecture
- Elise Ray, Olympic gymnast
- James W. Rouse, urban planner, real estate developer and philanthropist; grandfather of actor Edward Norton
- Christian Siriano, fashion designer, winner of fourth season of Project Runway (born in Columbia)
- Dave Sitek, guitarist and music producer, member of the band TV on the Radio
- Linda Tripp, central figure in the Monica Lewinsky scandal
- Terry Virts, astronaut
- Void, punk band
- Air Commodore Sir Frank Whittle, OM, KBE inventor of the jet engine