Arapahoe County, Colorado: New American county. In 2024, voted D+20%. Democratic peak: D+74 in 1896.
Key facts
- 2024 presidential margin
- D+20MIT Election Lab
- Political typology
- New AmericanAkashic typology
- Population
- 659,8442024 5-year
- Median household income
- $101,0872024 5-year
- White (non-Hispanic)
- 59.2%2024 5-year
- Black
- 10.9%2024 5-year
- Hispanic / Latino
- 21.7%2024 5-year
- Peak Democratic margin
- D+74 in 1896MIT Election Lab
- Peak Republican margin
- R+48 in 1892MIT Election Lab
- Most similar
- Mono County, CA · similarity 0.99
2024 results by precinct
2024 precinct map of Arapahoe CountyPrecinct-level 2024 presidential results for Arapahoe County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | −8.0% |
| 1884 | −13.8% |
| 1888 | −15.8% |
| 1892 | −48.1% |
| 1896 | +74.2% |
| 1900 | +13.7% |
| 1904 | −29.5% |
| 1908 | −5.8% |
| 1912 | +16.2% |
| 1916 | +28.4% |
| 1920 | −24.0% |
| 1924 | −46.0% |
| 1928 | −41.8% |
| 1932 | +14.2% |
| 1936 | +19.8% |
| 1940 | −2.7% |
| 1944 | −9.5% |
| 1948 | +6.5% |
| 1952 | −21.8% |
| 1956 | −26.8% |
| 1960 | −20.4% |
| 1964 | +9.5% |
| 1968 | −26.8% |
| 1972 | −46.5% |
| 1976 | −29.6% |
| 1980 | −38.6% |
| 1984 | −45.2% |
| 1988 | −21.9% |
| 1992 | −3.1% |
| 1996 | −8.9% |
| 2000 | −8.0% |
| 2004 | −4.0% |
| 2008 | +12.9% |
| 2012 | +9.9% |
| 2016 | +14.1% |
| 2020 | +24.6% |
| 2024 | +20.1% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| D | 190,725 | 125,311 | 325,631 | ||
| D | 213,673 | 127,356 | 350,283 | ||
| D | 159,885 | 117,053 | 303,048 | ||
| D | 153,905 | 125,588 | 285,516 | ||
| D | 148,218 | 113,866 | 266,148 | ||
| R | 110,262 | 119,475 | 232,365 | ||
| R | 82,614 | 97,768 | 189,942 | ||
| R | 68,306 | 82,778 | 162,996 | ||
| R | 66,607 | 72,221 | 183,935 | ||
| R | 61,113 | 95,926 | 159,245 | ||
| R | 39,891 | 107,556 | 149,554 | ||
| R | 30,148 | 79,594 | 127,980 | ||
| R | 33,685 | 63,154 | 99,526 | ||
| R | 18,631 | 52,283 | 72,376 | ||
| R | 18,569 | 33,712 | 56,519 | ||
| D | 27,940 | 23,071 | 51,358 | ||
| R | 17,400 | 26,379 | 43,916 | ||
| R | 11,351 | 19,716 | 31,243 | ||
| R | 9,843 | 15,402 | 25,534 | ||
| D | 7,943 | 6,962 | 15,080 | ||
| R | 7,485 | 9,057 | 16,611 | ||
| R | 7,571 | 7,988 | 15,696 | ||
| D | 6,489 | 4,272 | 11,171 | ||
| D | 5,796 | 4,287 | 10,642 | ||
| R | 2,463 | 6,086 | 8,659 | ||
| R | 1,209 | 4,267 | 6,643 | ||
| R | 1,752 | 2,930 | 4,900 | ||
| D | 2,652 | 1,443 | 4,255 | ||
| O | 1,379 | 765 | 3,796 | ||
| R | 1,340 | 1,514 | 2,998 | ||
| R | 717 | 1,351 | 2,147 | ||
| D | 33,754 | 25,469 | 60,483 | ||
| D | 42,521 | 6,057 | 49,134 | ||
| O | 0 | 11,331 | 23,553 | ||
| R | 8,320 | 11,541 | 20,408 | ||
| R | 5,310 | 7,133 | 13,168 | ||
| R | 3,582 | 4,214 | 7,898 | ||
| — | — | — | — |
Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
15.4%
English
10.9%
Irish
10.3%
Italian
4.0%
American
3.1%
French
2.1%
Scottish
2.1%
African American
8.7%
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 37.3 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$101,087
Arapahoe County ranks in the top 5% of US counties.
Arapahoe County$101,087
Colorado$95,470
United States$80,734
Arapahoe County ranks in the top 5% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
8.6%
Child poverty is below the national average.
Children under 1811.9%
Working age (18–64)7.6%
Seniors (65+)8.5%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
76.6%
speak English only
Spanish12.7%
Other Indo-European3.9%
Asian & Pacific Islander3.5%
Other languages3.3%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 65.3% of residents not counted as adherents by any reporting body.
Home to Aurora, Colorado's third-largest city, Arapahoe County has shifted from a reliably competitive suburb to one posting 20-point Democratic presidential margins, driven by rapid diversification and sustained population growth along the I-225 corridor.
Arapahoe County has leaned Democratic in recent presidential elections, reaching a Democratic margin of seventy-four points in 1896. Between 2020 and 2024 it moved five points toward the Republican candidate — part of the sharpest rightward shift recorded among any group of places in the country.
Its demographics describe the shift: a 59% non-Hispanic-white share, a median household income of $101,087, and a population of 659,844. The county's voting pattern over the last decade is most similar to that of Mono County and Jefferson County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Arapahoe County, Colorado. Akashic. https://akashic.app/county/08005/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Frequently asked questions
How did Arapahoe County, Colorado vote in 2024?
In 2024, Arapahoe County, Colorado voted Democratic by 20.1 points (D+20), carried by the Democratic candidate. Out of 325,631 votes cast, 190,725 went Democratic and 125,311 went Republican.
What is Arapahoe County, Colorado's political typology?
Akashic places Arapahoe County, Colorado in the "New American" typology — Communities where a large share of households speak a language other than English — multilingual, Democratic-leaning overall, yet the hardest-swinging bloc toward the Republican Party in 2024. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 12 times, Republican 23 times, and other 2 times.
When did Arapahoe County, Colorado last vote Republican?
The most recent presidential election in which Arapahoe County, Colorado voted Republican was 2004.
How many people live in Arapahoe County, Colorado?
Arapahoe County, Colorado has a population of 659,844 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Arapahoe County, Colorado?
Median household income in Arapahoe County, Colorado is $101,087 — above the national median of $80,734. The Colorado state median is $95,470.
What is the political history of Arapahoe County, Colorado?
Akashic tracks 38 presidential elections in Arapahoe County, Colorado from 1876 to 2024. Of those, 12 went Democratic and 23 went Republican. The county's typology — "New American" — captures where that record, its demographics, and its recent swing place it among American communities.