Arapahoe County Demographics

A map of Arapahoe County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	364,028	368,047	55.2%	56.2%
Hispanic	143,439	135,729	21.7%	20.7%
Black	69,137	68,152	10.5%	10.4%
Asian	39,886	41,855	6.0%	6.4%
Multiracial	36,333	33,450	5.5%	5.1%
Native American/Other	7,021	7,837	1.1%	1.2%

Arapahoe County, Colorado has an estimated population of 659,844, a less than 1% change from the 655,070 recorded in the 2020 Census. The population is 55.2% White, 21.7% Hispanic, 10.5% Black, 6.0% Asian, 5.5% Multiracial, and 1.1% Native American/Other. This demographic dot map shows the population of Arapahoe County, with one dot drawn for each person counted by the Census, color-coded by race.

Arapahoe has become slightly more racially diverse since the 2020 Census. It is considerably more diverse than Colorado overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Arapahoe County, that probability was 62.4% in 2020 and 63.1% in the most recent ACS estimates.

Arapahoe County is ranked the 3rd most populous county in Colorado, out of 64 counties. Arapahoe County was ranked the 3rd most populous county in the 2020 Census.

Arapahoe County's White Population

364,028 residents of Arapahoe County, or 55.2% of the population, identify as White. The share of White residents in Arapahoe County is lower than in Colorado overall, where 64.8% of the population is White. Arapahoe County ranks 54th statewide in terms of White residents as a share of the population, out of 64 counties.

Since the 2020 Census, Arapahoe County's White population has declined by an estimated 1.1%. White residents' share of Arapahoe County's population has decreased from 56.2% to 55.2%.

Arapahoe County is more White than neighboring Adams County (45.2% White), and Denver County (54% White). Arapahoe County is less White than neighboring Elbert County (82.8% White), Douglas County (77% White), and Broomfield County (72.4% White).

Arapahoe County's Black Population

69,137 residents of Arapahoe County, or 10.5% of the population, identify as Black. The share of Black residents in Arapahoe County is higher than in Colorado overall, where 3.8% of the population is Black. Arapahoe County ranks 1st statewide in terms of Black residents as a share of the population, out of 64 counties.

Since the 2020 Census, Arapahoe County's Black population has grown by an estimated 1.4%. Black residents' share of Arapahoe County's population has remained roughly unchanged at 10.5%.

Arapahoe County is more Black than neighboring Adams County (3.3% Black), Elbert County (0.7% Black), Denver County (8.6% Black), Douglas County (1.3% Black), and Broomfield County (1.1% Black).

Arapahoe County's Asian Population

39,886 residents of Arapahoe County, or 6.0% of the population, identify as Asian. The share of Asian residents in Arapahoe County is slightly higher than in Colorado overall, where 3.2% of the population is Asian. Arapahoe County ranks 2nd statewide in terms of Asian residents as a share of the population, out of 64 counties.

Since the 2020 Census, Arapahoe County's Asian population has declined by an estimated 4.7%. Asian residents' share of Arapahoe County's population has remained roughly unchanged at 6.0%.

Arapahoe County is more Asian than neighboring Adams County (3.8% Asian), Elbert County (0.7% Asian), Denver County (3.6% Asian), and Douglas County (5.8% Asian). Arapahoe County is less Asian than neighboring Broomfield County (6.9% Asian).

Arapahoe County's Hispanic Population

143,439 residents of Arapahoe County, or 21.7% of the population, identify as Hispanic. The share of Hispanic residents in Arapahoe County is comparable to the share in Colorado overall, where 22.5% of the population is Hispanic. Arapahoe County ranks 23rd statewide in terms of Hispanic residents as a share of the population, out of 64 counties.

Since the 2020 Census, Arapahoe County's Hispanic population has grown by an estimated 5.7%. Hispanic residents' share of Arapahoe County's population has increased from 20.7% to 21.7%.

Arapahoe County is more Hispanic than neighboring Elbert County (9.2% Hispanic), Douglas County (10.2% Hispanic), and Broomfield County (14.1% Hispanic). Arapahoe County is less Hispanic than neighboring Adams County (42.8% Hispanic), and Denver County (28% Hispanic).

Arapahoe County's Native American/Other Population

7,021 residents of Arapahoe County, or 1.1% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Arapahoe County is comparable to the share in Colorado overall, where 1% of the population is Native American/Other. Arapahoe County ranks 31st statewide in terms of Native American/Other residents as a share of the population, out of 64 counties.

Since the 2020 Census, Arapahoe County's Native American/Other population has declined by an estimated 10.4%. Native American/Other residents' share of Arapahoe County's population has remained roughly unchanged at 1.1%.

Arapahoe County is more Native American/Other than neighboring Denver County (1% Native American/Other), Douglas County (0.7% Native American/Other), and Broomfield County (0.8% Native American/Other).

Arapahoe County's Multiracial Population

36,333 residents of Arapahoe County, or 5.5% of the population, identify as Multiracial. The share of Multiracial residents in Arapahoe County is comparable to the share in Colorado overall, where 4.6% of the population is Multiracial. Arapahoe County ranks 6th statewide in terms of Multiracial residents as a share of the population, out of 64 counties.

Since the 2020 Census, Arapahoe County's Multiracial population has grown by an estimated 8.6%. Multiracial residents' share of Arapahoe County's population has remained roughly unchanged at 5.5%.

Arapahoe County is more Multiracial than neighboring Adams County (3.7% Multiracial), Denver County (4.8% Multiracial), Douglas County (4.9% Multiracial), and Broomfield County (4.7% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.