Castro County Demographics

A map of Castro County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
Hispanic	4,817	4,784	65.6%	64.9%
White	2,180	2,328	29.7%	31.6%
Multiracial	133	90	1.8%	1.2%
Black	86	95	1.2%	1.3%
Asian	66	22	0.9%	0.3%
Native American/Other	62	52	0.8%	0.7%

Castro County, Texas has an estimated population of 7,344, a less than 1% change from the 7,371 recorded in the 2020 Census. The population is 65.6% Hispanic, 29.7% White, 1.8% Multiracial, 1.2% Black, 0.9% Asian, and 0.8% Native American/Other. This demographic dot map shows the population of Castro County, with one dot drawn for each person counted by the Census, color-coded by race.

Castro is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Texas overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Castro County, that probability was 47.9% in 2020 and 48.1% in the most recent ACS estimates.

Castro County is ranked the 182nd most populous county in Texas, out of 254 counties. Castro County was ranked the 182nd most populous county in the 2020 Census.

Castro County's White Population

2,180 residents of Castro County, or 29.7% of the population, identify as White. The share of White residents in Castro County is lower than in Texas overall, where 39.1% of the population is White. Castro County ranks 219th statewide in terms of White residents as a share of the population, out of 254 counties.

Since the 2020 Census, Castro County's White population has declined by an estimated 6.4%. White residents' share of Castro County's population has decreased from 31.6% to 29.7%.

Castro County is more White than neighboring Deaf Smith County (21% White). Castro County is less White than neighboring Lamb County (36% White), Parmer County (30.4% White), Swisher County (41.5% White), and Randall County (66.5% White).

Castro County's Black Population

86 residents of Castro County, or 1.2% of the population, identify as Black. The share of Black residents in Castro County is considerably lower than in Texas overall, where 11.9% of the population is Black. Castro County ranks 175th statewide in terms of Black residents as a share of the population, out of 254 counties.

Since the 2020 Census, Castro County's Black population has declined by an estimated 9.5%. Black residents' share of Castro County's population has remained roughly unchanged at 1.2%.

Castro County is more Black than neighboring Parmer County (0.3% Black), and Deaf Smith County (0.8% Black). Castro County is less Black than neighboring Lamb County (3.3% Black), Swisher County (7.7% Black), and Randall County (3.1% Black).

Castro County's Asian Population

66 residents of Castro County, or 0.9% of the population, identify as Asian. The share of Asian residents in Castro County is slightly lower than in Texas overall, where 5.5% of the population is Asian. Castro County ranks 201st statewide in terms of Asian residents as a share of the population, out of 254 counties.

Since the 2020 Census, Castro County's Asian population has grown by an estimated 200.0%. Asian residents' share of Castro County's population has increased from 0.3% to 0.9%.

Castro County is more Asian than neighboring Lamb County (0.7% Asian), Parmer County (0% Asian), Swisher County (0% Asian), and Deaf Smith County (0% Asian). Castro County is less Asian than neighboring Randall County (1.7% Asian).

Castro County's Hispanic Population

4,817 residents of Castro County, or 65.6% of the population, identify as Hispanic. The share of Hispanic residents in Castro County is significantly higher than in Texas overall, where 39.7% of the population is Hispanic. Castro County ranks 30th statewide in terms of Hispanic residents as a share of the population, out of 254 counties.

Since the 2020 Census, Castro County's Hispanic population has remained roughly the same. Hispanic residents' share of Castro County's population has increased from 64.9% to 65.6%.

Castro County is more Hispanic than neighboring Lamb County (58.3% Hispanic), Swisher County (46.3% Hispanic), and Randall County (24.6% Hispanic). Castro County is less Hispanic than neighboring Parmer County (66.7% Hispanic), and Deaf Smith County (76.4% Hispanic).

Castro County's Native American/Other Population

62 residents of Castro County, or 0.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Castro County is comparable to the share in Texas overall, where 0.6% of the population is Native American/Other. Castro County ranks 115th statewide in terms of Native American/Other residents as a share of the population, out of 254 counties.

Since the 2020 Census, Castro County's Native American/Other population has grown by an estimated 19.2%. Native American/Other residents' share of Castro County's population has remained roughly unchanged at 0.8%.

Castro County is more Native American/Other than neighboring Lamb County (0.4% Native American/Other), Parmer County (0.3% Native American/Other), and Deaf Smith County (0.4% Native American/Other). Castro County is less Native American/Other than neighboring Swisher County (1.6% Native American/Other).

Castro County's Multiracial Population

133 residents of Castro County, or 1.8% of the population, identify as Multiracial. The share of Multiracial residents in Castro County is comparable to the share in Texas overall, where 3.1% of the population is Multiracial. Castro County ranks 228th statewide in terms of Multiracial residents as a share of the population, out of 254 counties.

Since the 2020 Census, Castro County's Multiracial population has grown by an estimated 47.8%. Multiracial residents' share of Castro County's population has increased from 1.2% to 1.8%.

Castro County is more Multiracial than neighboring Lamb County (1.4% Multiracial), and Deaf Smith County (1.3% Multiracial). Castro County is less Multiracial than neighboring Parmer County (2.4% Multiracial), Swisher County (2.8% Multiracial), and Randall County (3.3% 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.