Williamson County Demographics

A map of Williamson County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	358,479	336,410	53.3%	55.2%
Hispanic	166,454	147,088	24.7%	24.2%
Asian	66,854	53,982	9.9%	8.9%
Black	45,037	38,557	6.7%	6.3%
Multiracial	30,162	27,605	4.5%	4.5%
Native American/Other	5,702	5,375	0.8%	0.9%

Williamson County, Texas has an estimated population of 672,688, a large increase from the 609,017 recorded in the 2020 Census. The population is 53.3% White, 24.7% Hispanic, 9.9% Asian, 6.7% Black, 4.5% Multiracial, and 0.8% Native American/Other. This demographic dot map shows the population of Williamson County, with one dot drawn for each person counted by the Census, color-coded by race.

Williamson has become more racially diverse since the 2020 Census. It is 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 Williamson County, that probability was 62.3% in 2020 and 63.8% in the most recent ACS estimates.

Williamson County is ranked the 12th most populous county in Texas, out of 254 counties. Williamson County was ranked the 12th most populous county in the 2020 Census.

Williamson County's White Population

358,479 residents of Williamson County, or 53.3% of the population, identify as White. The share of White residents in Williamson County is considerably higher than in Texas overall, where 39.1% of the population is White. Williamson County ranks 142nd statewide in terms of White residents as a share of the population, out of 254 counties.

Since the 2020 Census, Williamson County's White population has grown by an estimated 6.6%. White residents' share of Williamson County's population has decreased from 55.2% to 53.3%.

Williamson County is more White than neighboring Travis County (46.9% White), Bell County (42.4% White), and Bastrop County (44.4% White). Williamson County is less White than neighboring Burnet County (70.7% White), and Milam County (61.6% White).

Williamson County's Black Population

45,037 residents of Williamson County, or 6.7% of the population, identify as Black. The share of Black residents in Williamson County is lower than in Texas overall, where 11.9% of the population is Black. Williamson County ranks 84th statewide in terms of Black residents as a share of the population, out of 254 counties.

Since the 2020 Census, Williamson County's Black population has grown by an estimated 16.8%. Black residents' share of Williamson County's population has remained roughly unchanged at 6.7%.

Williamson County is more Black than neighboring Burnet County (1.2% Black), and Bastrop County (5.7% Black). Williamson County is less Black than neighboring Travis County (7.8% Black), Bell County (21.5% Black), and Milam County (8.1% Black).

Williamson County's Asian Population

66,854 residents of Williamson County, or 9.9% of the population, identify as Asian. The share of Asian residents in Williamson County is slightly higher than in Texas overall, where 5.5% of the population is Asian. Williamson County ranks 4th statewide in terms of Asian residents as a share of the population, out of 254 counties.

Since the 2020 Census, Williamson County's Asian population has grown by an estimated 23.8%. Asian residents' share of Williamson County's population has increased from 8.9% to 9.9%.

Williamson County is more Asian than neighboring Travis County (7.8% Asian), Bell County (2.9% Asian), Burnet County (0.7% Asian), Bastrop County (0.8% Asian), and Milam County (0.5% Asian).

Williamson County's Hispanic Population

166,454 residents of Williamson County, or 24.7% of the population, identify as Hispanic. The share of Hispanic residents in Williamson County is significantly lower than in Texas overall, where 39.7% of the population is Hispanic. Williamson County ranks 147th statewide in terms of Hispanic residents as a share of the population, out of 254 counties.

Since the 2020 Census, Williamson County's Hispanic population has grown by an estimated 13.2%. Hispanic residents' share of Williamson County's population has increased from 24.2% to 24.7%.

Williamson County is more Hispanic than neighboring Burnet County (23.4% Hispanic). Williamson County is less Hispanic than neighboring Travis County (32.6% Hispanic), Bell County (26.3% Hispanic), Bastrop County (45% Hispanic), and Milam County (26% Hispanic).

Williamson County's Native American/Other Population

5,702 residents of Williamson 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 Williamson County is comparable to the share in Texas overall, where 0.6% of the population is Native American/Other. Williamson County ranks 59th statewide in terms of Native American/Other residents as a share of the population, out of 254 counties.

Since the 2020 Census, Williamson County's Native American/Other population has grown by an estimated 6.1%. Native American/Other residents' share of Williamson County's population has remained roughly unchanged at 0.8%.

Williamson County is more Native American/Other than neighboring Travis County (0.6% Native American/Other), Burnet County (0.4% Native American/Other), Bastrop County (0.6% Native American/Other), and Milam County (0.1% Native American/Other). Williamson County is less Native American/Other than neighboring Bell County (1.1% Native American/Other).

Williamson County's Multiracial Population

30,162 residents of Williamson County, or 4.5% of the population, identify as Multiracial. The share of Multiracial residents in Williamson County is comparable to the share in Texas overall, where 3.1% of the population is Multiracial. Williamson County ranks 22nd statewide in terms of Multiracial residents as a share of the population, out of 254 counties.

Since the 2020 Census, Williamson County's Multiracial population has grown by an estimated 9.3%. Multiracial residents' share of Williamson County's population has remained roughly unchanged at 4.5%.

Williamson County is more Multiracial than neighboring Travis County (4.2% Multiracial), Burnet County (3.5% Multiracial), Bastrop County (3.4% Multiracial), and Milam County (3.7% Multiracial). Williamson County is less Multiracial than neighboring Bell County (5.8% 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.