Alamosa County Demographics

A map of Alamosa County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
Hispanic	7,989	7,701	48.2%	47.0%
White	7,498	7,490	45.2%	45.7%
Multiracial	400	494	2.4%	3.0%
Black	288	211	1.7%	1.3%
Native American/Other	234	338	1.4%	2.1%
Asian	172	142	1.0%	0.9%

Alamosa County, Colorado has an estimated population of 16,581, a slight increase from the 16,376 recorded in the 2020 Census. The population is 48.2% Hispanic, 45.2% White, 2.4% Multiracial, 1.7% Black, 1.4% Native American/Other, and 1.0% Asian. This demographic dot map shows the population of Alamosa County, with one dot drawn for each person counted by the Census, color-coded by race.

Alamosa has become slightly less racially diverse since the 2020 Census. It is 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 Alamosa County, that probability was 56.8% in 2020 and 56.2% in the most recent ACS estimates.

Alamosa County is ranked the 31st most populous county in Colorado, out of 64 counties. Alamosa County was ranked the 31st most populous county in the 2020 Census.

Alamosa County's White Population

7,498 residents of Alamosa County, or 45.2% of the population, identify as White. The share of White residents in Alamosa County is significantly lower than in Colorado overall, where 64.8% of the population is White. Alamosa County ranks 63rd statewide in terms of White residents as a share of the population, out of 64 counties.

Since the 2020 Census, Alamosa County's White population has remained roughly the same. White residents' share of Alamosa County's population has decreased from 45.7% to 45.2%.

Alamosa County is more White than neighboring Costilla County (37.3% White). Alamosa County is less White than neighboring Conejos County (46% White), Rio Grande County (54.7% White), Custer County (88.9% White), and Saguache County (54.9% White).

Alamosa County's Black Population

288 residents of Alamosa County, or 1.7% of the population, identify as Black. The share of Black residents in Alamosa County is slightly lower than in Colorado overall, where 3.8% of the population is Black. Alamosa County ranks 14th statewide in terms of Black residents as a share of the population, out of 64 counties.

Since the 2020 Census, Alamosa County's Black population has grown by an estimated 36.5%. Black residents' share of Alamosa County's population has remained roughly unchanged at 1.7%.

Alamosa County is more Black than neighboring Conejos County (0.1% Black), Rio Grande County (0.3% Black), Custer County (0% Black), and Saguache County (0% Black). Alamosa County is less Black than neighboring Costilla County (1.9% Black).

Alamosa County's Asian Population

172 residents of Alamosa County, or 1.0% of the population, identify as Asian. The share of Asian residents in Alamosa County is slightly lower than in Colorado overall, where 3.2% of the population is Asian. Alamosa County ranks 21st statewide in terms of Asian residents as a share of the population, out of 64 counties.

Since the 2020 Census, Alamosa County's Asian population has grown by an estimated 21.1%. Asian residents' share of Alamosa County's population has remained roughly unchanged at 1.0%.

Alamosa County is more Asian than neighboring Conejos County (0.4% Asian), and Rio Grande County (0.1% Asian). Alamosa County is less Asian than neighboring Costilla County (1.5% Asian), Custer County (1.1% Asian), and Saguache County (1.2% Asian).

Alamosa County's Hispanic Population

7,989 residents of Alamosa County, or 48.2% of the population, identify as Hispanic. The share of Hispanic residents in Alamosa County is significantly higher than in Colorado overall, where 22.5% of the population is Hispanic. Alamosa County ranks 3rd statewide in terms of Hispanic residents as a share of the population, out of 64 counties.

Since the 2020 Census, Alamosa County's Hispanic population has grown by an estimated 3.7%. Hispanic residents' share of Alamosa County's population has increased from 47.0% to 48.2%.

Alamosa County is more Hispanic than neighboring Rio Grande County (40.7% Hispanic), Custer County (4.2% Hispanic), and Saguache County (36.8% Hispanic). Alamosa County is less Hispanic than neighboring Costilla County (54.7% Hispanic), and Conejos County (49.8% Hispanic).

Alamosa County's Native American/Other Population

234 residents of Alamosa County, or 1.4% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Alamosa County is comparable to the share in Colorado overall, where 1% of the population is Native American/Other. Alamosa County ranks 5th statewide in terms of Native American/Other residents as a share of the population, out of 64 counties.

Since the 2020 Census, Alamosa County's Native American/Other population has declined by an estimated 30.8%. Native American/Other residents' share of Alamosa County's population has decreased from 2.1% to 1.4%.

Alamosa County is more Native American/Other than neighboring Costilla County (0.2% Native American/Other), and Saguache County (0.7% Native American/Other). Alamosa County is less Native American/Other than neighboring Conejos County (1.8% Native American/Other), and Custer County (2.2% Native American/Other).

Alamosa County's Multiracial Population

400 residents of Alamosa County, or 2.4% of the population, identify as Multiracial. The share of Multiracial residents in Alamosa County is slightly lower than in Colorado overall, where 4.6% of the population is Multiracial. Alamosa County ranks 52nd statewide in terms of Multiracial residents as a share of the population, out of 64 counties.

Since the 2020 Census, Alamosa County's Multiracial population has declined by an estimated 19.0%. Multiracial residents' share of Alamosa County's population has decreased from 3.0% to 2.4%.

Alamosa County is more Multiracial than neighboring Conejos County (1.9% Multiracial). Alamosa County is less Multiracial than neighboring Costilla County (4.4% Multiracial), Rio Grande County (2.8% Multiracial), Custer County (3.7% Multiracial), and Saguache County (6.4% 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.