Jefferson County, CO
CO · Presidential Elections 1880–2024
Jefferson County, CO (Colorado) voted D+19.5 for Kamala Harris (Democrat) in the 2024 presidential election, with Harris receiving 210,875 votes (58.3%) to 140,505 (38.84%) for Trump.
This represents a D+0.9% swing toward Democrats compared to 2020. Jefferson County is classified as a solid Democratic county. Jefferson County has voted Democratic in every presidential election since 2008. The county has a population of approximately 579,377.
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Quick Stats
Demographics
Community Profile
Religious Composition
Source: Religion Census 2020Ancestry Groups
Source: Census ACSTop reported ancestry groups (compared to national average).
Age Distribution
Employment by Industry
Census ACSPresidential Elections
Presidential Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2024 | 58.3%(210,875) | 38.8%(140,505) | D+19.5 | D+0.9 |
| 2020 | 57.9%(218,393) | 39.3%(148,414) | D+18.5 | D+11.7 |
| 2016 | 48.9%(160,776) | 42.0%(138,177) | D+6.9 | D+2.0 |
| 2012 | 51.2%(159,296) | 46.4%(144,197) | D+4.9 | R+4.1 |
| 2008 | 53.6%(158,153) | 44.6%(131,627) | D+9.0 | D+14.2 |
| 2004 | 46.6%(126,558) | 51.8%(140,644) | R+5.2 | D+3.0 |
| 2000 | 42.9%(100,970) | 51.0%(120,138) | R+8.1 | R+2.4 |
| 1996 | 42.7%(89,494) | 48.4%(101,517) | R+5.7 | R+4.9 |
| 1992 | 36.2%(80,834) | 37.0%(82,705) | R+0.8 | D+13.9 |
| 1988 | 41.6%(81,824) | 56.4%(110,820) | R+14.8 | D+24.4 |
Source: Official state election returns via MIT Election Data + Science Lab
Presidential Margin Trend
Jefferson County, CO • 1880–2024
Senate Elections
Senate Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2014 | 47.3%(121,109) | 46.9%(120,240) | D+0.3 | R+10.0 |
| 2008 | 52.6%(151,616) | 42.3%(121,889) | D+10.3 | D+15.3 |
| 2002 | 45.6%(86,278) | 50.5%(95,680) | R+5.0 | D+4.3 |
| 1996 | 44.0%(86,773) | 53.3%(105,119) | R+9.3 | D+6.3 |
| 1990 | 40.5%(60,096) | 56.0%(83,212) | R+15.6 | D+23.5 |
| 1984 | 29.9%(53,903) | 69.0%(124,278) | R+39.1 | R+6.9 |
| 1978 | 33.5%(36,642) | 65.7%(71,825) | R+32.2 | R+20.5 |
| 1972 | 43.6%(48,533) | 55.3%(61,567) | R+11.7 | D+15.6 |
| 1966 | 36.3%(23,106) | 63.7%(40,467) | R+27.3 | R+11.1 |
| 1960 | 41.6%(23,327) | 57.8%(32,430) | R+16.2 | R+7.9 |
Source: Official state election returns via MIT Election Data + Science Lab
Governor Elections
Governor Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 61.8%(185,398) | 36.2%(108,638) | D+25.6 | D+12.7 |
| 2018 | 54.4%(166,455) | 41.5%(127,038) | D+12.9 | D+6.7 |
| 2014 | 50.8%(130,196) | 44.6%(114,398) | D+6.2 | R+37.9 |
| 2010 | 50.8%(116,120) | 6.7%(15,419) | D+44.1 | D+26.2 |
| 2006 | 57.5%(119,420) | 39.7%(82,314) | D+17.9 | D+50.5 |
| 2002 | 32.1%(60,656) | 64.7%(122,356) | R+32.6 | R+29.5 |
| 1998 | 47.2%(88,561) | 50.3%(94,387) | R+3.1 | R+21.6 |
| 1994 | 56.2%(87,815) | 37.7%(58,861) | D+18.5 | R+9.8 |
| 1990 | 62.7%(92,770) | 34.3%(50,778) | D+28.4 | D+13.8 |
| 1986 | 56.9%(82,031) | 42.3%(60,987) | D+14.6 | R+19.8 |
Source: Official state election returns via MIT Election Data + Science Lab