In 2022, 40 U.S. House elections were decided by margins of victory of five percentage points (pp) or less, up from 37 in 2020.
Democrats won 22 of those races, up from 19 in 2020. Republicans won 18, the same number as in 2020.
California and New York each had five races decided by five percentage points or less — the most in the country. Three of Nevada’s four districts were decided by such margins.
In Nevada, Democrats won the three districts decided by 5 pp or less – more than in any other state. In New York, Republicans won four of five races decided by 5 pp or less – more than in any other state.
In 2020, California and Texas had the most districts decided by five percentage points or less, with four each, followed by Iowa and Pennsylvania, with three districts each.
Democrats were most successful in Pennsylvania, where they won all three districts decided by five percentage points or less. Republicans were most successful in California, where they won all four districts decided by such margins.
Compared to previous cycles, Democrats won more U.S. House races decided by five percentage points or less this year than in any other year since 2012. On the Republican side, the 18 races the party won this year are tied with 2020 as the second-most they have won since 2012.
The closest U.S. House election this year was in Colorado’s 3rd Congressional District, where Lauren Boebert (R) defeated Adam Frisch (D) by a margin of 0.17%, or 546 votes out of more than 300,000 votes cast. Boebert’s margin was 540 votes more than the closest race in 2020. In that race, Mariannette Miller-Meeks (R) defeated Rita Hart (D) by a margin of 6 votes out of nearly 400,000 cast, the narrowest margin of victory in any U.S. House election since 1984.