Incumbent Ken Calvert (R) defeated incumbent Young Kim (R) in the general election to represent California's 40th Congressional District on Nov. 3. Click here for detailed results. They defeated six other candidates to win the top-two primary on June 2, 2026.

Heading into the election, Calvert represented California's 41st Congressional District, and Kim represented the 40th District. The two incumbents were drawn into the same district as a result of Proposition 50, a redistricting amendment voters approved in November 2025. According to ABC7's Josh Haskell, Calvert represented 51% of the new district and Kim represented 35% of the new district. In the primary, Calvert received 35% of the vote and Kim 21%.

Notable endorsements for Calvert included Republican gubernatorial candidate Steve Hilton, the California Republican Assembly, and the California Congress of Republicans. Notable endorsements for Kim included U.S. Rep. James Gallagher (R-Calif.), state Senate Minority Leader Brian Jones (R), and Americans for Prosperity Action.

Calvert was first elected to Congress in 1992. He received his associate degree from Chaffey College and his bachelor's degree from San Diego State University. Before his election to Congress, Calvert was a small business owner in the restaurant and real estate industries.

Calvert ran on his record. His campaign website said, "Ken’s legislative work has received top ratings from the Americans for Tax Reform, U.S. Chamber of Commerce, National Federation of Independent Businesses, National Association of Manufacturers, and the 60 Plus Association." He highlighted his legislation creating the E-Verify system to verify employees' legal status, securing federal funding for transportation and environmental projects, and constituent services.

Kim was first elected to Congress in 2020. She received her bachelor's degree from the University of Southern California. She worked as a business owner, financial analyst, and staff for then-U.S. Rep. Ed Royce (R). She represented District 65 in the California State Assembly from 2014 to 2016.

Kim ran on her record. Her campaign website said, "In Congress, I continue to fight every day to ensure President Trump has allies to undo the disastrous Joe Biden-Nancy Pelosi agenda that caused skyrocketing prices, rising crime, an open border, and a political class that serves the swamp instead of fighting for working families."