Costilla County Demographics

A map of Costilla County's Population by Race

Costilla County, Colorado has an estimated population of 3,607, an increase from the 3,499 recorded in the 2020 Census. The population is 54.7% Hispanic, 37.3% White, 4.4% Multiracial, 1.9% Black, 1.5% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Costilla County, with one dot drawn for each person counted by the Census, color-coded by race.

Costilla has become slightly more 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 Costilla County, that probability was 55.1% in 2020 and 55.9% in the most recent ACS estimates.

Costilla County is ranked the 55th most populous county in Colorado, out of 64 counties. Costilla County was ranked the 56th most populous county in the 2020 Census.

Costilla County's White Population

1,345 residents of Costilla County, or 37.3% of the population, identify as White. The share of White residents in Costilla County is significantly lower than in Colorado overall, where 64.8% of the population is White. Costilla County ranks 64th statewide in terms of White residents as a share of the population, out of 64 counties.

Since the 2020 Census, Costilla County's White population has grown by an estimated 9.0%. White residents' share of Costilla County's population has increased from 35.3% to 37.3%.

Costilla County is less White than neighboring Alamosa County (45.2% White), Huerfano County (62.9% White), Taos County (40.5% White), Conejos County (46% White), and Custer County (88.9% White).

Costilla County's Black Population

68 residents of Costilla County, or 1.9% of the population, identify as Black. The share of Black residents in Costilla County is comparable to the share in Colorado overall, where 3.8% of the population is Black. Costilla County ranks 22nd statewide in terms of Black residents as a share of the population, out of 64 counties.

Since the 2020 Census, Costilla County's Black population has grown by an estimated 106.1%. Black residents' share of Costilla County's population has increased from 0.9% to 1.9%.

Costilla County is more Black than neighboring Alamosa County (1.7% Black), Huerfano County (0% Black), Taos County (0.3% Black), Conejos County (0.1% Black), and Custer County (0% Black).

Costilla County's Asian Population

55 residents of Costilla County, or 1.5% of the population, identify as Asian. The share of Asian residents in Costilla County is comparable to the share in Colorado overall, where 3.2% of the population is Asian. Costilla County ranks 12th statewide in terms of Asian residents as a share of the population, out of 64 counties.

Since the 2020 Census, Costilla County's Asian population has remained roughly the same. Asian residents' share of Costilla County's population has remained roughly unchanged at 1.5%.

Costilla County is more Asian than neighboring Alamosa County (1% Asian), Huerfano County (0.2% Asian), Taos County (0.7% Asian), Conejos County (0.4% Asian), and Custer County (1.1% Asian).

Costilla County's Hispanic Population

1,973 residents of Costilla County, or 54.7% of the population, identify as Hispanic. The share of Hispanic residents in Costilla County is significantly higher than in Colorado overall, where 22.5% of the population is Hispanic. Costilla County ranks 1st statewide in terms of Hispanic residents as a share of the population, out of 64 counties.

Since the 2020 Census, Costilla County's Hispanic population has remained roughly the same. Hispanic residents' share of Costilla County's population has decreased from 56.8% to 54.7%.

Costilla County is more Hispanic than neighboring Alamosa County (48.2% Hispanic), Huerfano County (30.6% Hispanic), Taos County (50.6% Hispanic), Conejos County (49.8% Hispanic), and Custer County (4.2% Hispanic).

Costilla County's Native American/Other Population

6 residents of Costilla County, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Costilla County is comparable to the share in Colorado overall, where 1% of the population is Native American/Other. Costilla County ranks 21st statewide in terms of Native American/Other residents as a share of the population, out of 64 counties.

Since the 2020 Census, Costilla County's Native American/Other population has declined by an estimated 87.2%. Native American/Other residents' share of Costilla County's population has decreased from 1.3% to 0.2%.

Costilla County is less Native American/Other than neighboring Alamosa County (1.4% Native American/Other), Huerfano County (1.7% Native American/Other), Taos County (5.6% Native American/Other), Conejos County (1.8% Native American/Other), and Custer County (2.2% Native American/Other).

Costilla County's Multiracial Population

160 residents of Costilla County, or 4.4% of the population, identify as Multiracial. The share of Multiracial residents in Costilla County is comparable to the share in Colorado overall, where 4.6% of the population is Multiracial. Costilla County ranks 29th statewide in terms of Multiracial residents as a share of the population, out of 64 counties.

Since the 2020 Census, Costilla County's Multiracial population has grown by an estimated 12.7%. Multiracial residents' share of Costilla County's population has remained roughly unchanged at 4.4%.

Costilla County is more Multiracial than neighboring Alamosa County (2.4% Multiracial), Taos County (2.3% Multiracial), Conejos County (1.9% Multiracial), and Custer County (3.7% Multiracial). Costilla County is less Multiracial than neighboring Huerfano County (4.6% 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.