CA-42 — 2020 U.S. House election
Recent presidential results, current district lines
Akashiccongressional district2020 US House electionCA-42 · U.S. HouseCalvertR+14.3
How it voted
Share of the 2020 vote
| Ken Calvert (i) ✓Republican | 57.1% | 210,274 |
|---|---|---|
| William \"Liam\" O'MaraDemocrat | 42.9% | 157,773 |
D+60R+60
District boundary, filled by its own 2020 D-vs-R margin — precinct detail where available, over faint county context.
The boundary drawn is the current CA-42 (cd:120, the 2026 map); the 2020 election ran under that decade's own lines. The result shown is the certified 2020 contest.
Margin history
CA-42 across every cycle on record. Each year links to its district page.
| Year | Won | Margin | Votes |
|---|---|---|---|
| 2024 | D | 233,563 | |
| 2022 | D | 145,120 | |
| 2020 | R | 368,047 | |
| 2018 | R | 231,932 | |
| 2016 | R | 254,236 | |
| 2014 | R | 113,390 | |
| 2012 | R | 214,947 | |
| 2010 | R | 204,398 | |
| 2008 | R | 263,313 | |
| 2006 | R | 129,720 | |
| 2004 | R | 246,025 | |
| 2002 | R | 145,246 | |
| 2000 | D | 151,577 | |
| 1998 | D | 112,520 | |
| 1996 | D | 103,336 | |
| 1994 | D | 115,205 | |
| 1992 | D | 157,455 | |
| 1990 | R | 184,286 | |
| 1988 | R | 238,621 | |
| 1986 | R | 192,711 | |
| 1984 | R | 243,619 | |
| 1982 | R | 207,049 | |
| 1980 | R | 149,649 | |
| 1978 | D | 115,445 | |
| 1976 | D | 135,627 |
Same ballot, 2020CA
Source. MIT Election Data + Science Lab — 2020 US House returns, party-classified by literal ballot party · results as certified for the 2020 contest; the boundary drawn and the presidential strip use the current district map (cd:120, the 2026 lines) — the election itself ran under earlier lines. Real returns — nothing estimated.