Contra Costa County, California
Votes
Percentages
| Year | Democrat | Republican | Other | Total | |||
|---|---|---|---|---|---|---|---|
| 2000 | 224,338 | 58.8% | 141,373 | 37.1% | 15,767 | 4.1% | 381,478 |
| 2004 | 257,254 | 62.4% | 150,608 | 36.5% | 4,277 | 1.0% | 412,139 |
| 2008 | 306,983 | 68.0% | 136,436 | 30.2% | 8,231 | 1.8% | 451,650 |
| 2012 | 290,824 | 66.4% | 136,517 | 31.2% | 10,885 | 2.5% | 438,226 |
| 2016 | 319,287 | 68.5% | 115,956 | 24.9% | 30,932 | 6.6% | 466,175 |
| 2020 | 416,386 | 71.6% | 152,877 | 26.3% | 12,053 | 2.1% | 581,316 |