She was elected to the Assembly in 2014 after unseating Democratic Assemblymember Sharon Quirk-Silva. In 2016, in turn, Quirk-Silva unseated Kim in a rematch.  Prior to being elected to the Assembly, she was the Director of Community Relations and Asian Affairs for Congressman Ed Royce.
In 2017, Young Kim announced she would be running for Orange County Supervisor, a nonpartisan office in the 4th district which includes the cities of Fullerton, Placentia, La Habra, Brea and portions of Anaheim and Buena Park. 
In 2018, Young Kim won her race for California's 39th Congressional District. She defeated incumbent Gil Cisneros, becoming the first Korean-American to serve in public office.
Young Kim believe sin improving Border Security while facilitating legal immigration. Young believes in the humane treatment of families arriving to the United States without legal documentation.
Reduce unnecessary regulations, increase trade, and work with state and local leaders to create an environment where business can prosper and create good paying jobs.
Congresswoman Mimi Walters endorsed Kim saying she was energetic, enthusiastic and dedicated. Other members of Congress, including Jeff Denham, Steve Knight, Ed Royce, David Valadao, Darrell Issa, Doug LaMalfa, Devin Nunes and Kevin McCarty, are among the politicians who endorsed her. 
2014 California State Assembly
|California's 65th State Assembly district election, 2014|
|Democratic||Sharon Quirk-Silva ( incumbent )||17,896||45.3|
|Democratic||Sharon Quirk-Silva ( incumbent )||35,204||45.4|
|Republican gain from Democratic|
2016 California State Assembly candidacy
|California's 65th State Assembly district election, 2016|
|Republican||Young Kim ( incumbent )||36,028||45.7|
|Republican||Young Kim ( incumbent )|