We're tracking the results of California's competitive U.S. House elections.

Both parties are defending seats in the state that are considered undecided. Of the congressional district races that Cook Political Report's House Ratings consider competitive, seven are held by Republicans, two are held by Democrats and one is open.

Voters in potential swing congressional districts in Orange County, the Inland Empire and the Central Valley could shift the balance of power in the House. The Republicans have a slim majority. The House will flip if Democrats win four seats statewide.

California's most competitive races are in Orange County's 45th District, where Derek Tran is running against Republican Rep. Michelle Steel; Riverside County's 41st District, where Will Rollins is running against the longest-serving GOP member of California's congressional delegation, Rep. Ken Calvert; the Antelope Valley's 27th District, where George Whitesides is running against Rep. Mike Garcia; and the always competitive Central Valley, where Adam Gray and Rudy Salas face off against Reps. John Duarte (CD-13) and David Valadao (CD-22).

Democratic State Senator Dave Min and Republican Scott Baugh are running in California's 47th Congressional District for the open seat previously held by Democratic Representative Katie Porter.