2024Final results
2024 election for California's 21st District
U.S. House · California
Jim Costa (D) won with 52.6% of the vote, defeating Michael Maher (R) by 5.2 points.
Jim CostaDemocrat · winner
52.6%102,701
Michael MaherRepublican
47.4%92,560
195,261 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 3:26 AM ET
The seat over time
D − R margin in this seat's races around 2024
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 3:26 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Jim CostaMichael Maher
$1.7M
Raised by the campaign
$785K
$1.9M
Spent by the campaign
$753.6K
$208.9K
Cash on hand
$33.7K
Campaign money: FEC, through Dec 31, 2024.
Source: FEC campaign filingsUpdated Dec 31, 2024