San Marcos, TX Demographics

A map of San Marcos's Population by Race

San Marcos, Texas has an estimated population of 70,897, an increase from the 67,553 recorded in the 2020 Census. The population is 44.6% White, 42.2% Hispanic, 5.2% Black, 3.9% Multiracial, 2.1% Asian, and 2.0% Native American/Other. This demographic dot map shows the population of San Marcos, with one dot drawn for each person counted by the Census, color-coded by race.

San Marcos has become less racially diverse since 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 San Marcos, that probability was 64.7% in 2020 and 61.8% in the most recent ACS estimates.

San Marcos is ranked the 59th most populous place in Texas, out of 1,863 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). San Marcos was ranked the 58th most populous place in the 2020 Census.

San Marcos's White Population

31,617 residents of San Marcos, or 44.6% of the population, identify as White. The share of White residents in San Marcos is higher than in Texas overall, where 39.1% of the population is White. San Marcos ranks 1148th statewide in terms of White residents as a share of the population, out of 1,863 places.

Since the 2020 Census, San Marcos's White population has grown by an estimated 10.9%. White residents' share of San Marcos's population has increased from 42.2% to 44.6%.

San Marcos is more White than neighboring Redwood (12.6% White), Martindale (38.6% White), Kyle (38.9% White), and Uhland (17.9% White). San Marcos is less White than neighboring Staples (48.6% White).

San Marcos's Black Population

3,698 residents of San Marcos, or 5.2% of the population, identify as Black. The share of Black residents in San Marcos is lower than in Texas overall, where 11.9% of the population is Black. San Marcos ranks 452nd statewide in terms of Black residents as a share of the population, out of 1,863 places.

Since the 2020 Census, San Marcos's Black population has declined by an estimated 17.1%. Black residents' share of San Marcos's population has decreased from 6.6% to 5.2%.

San Marcos is more Black than neighboring Redwood (2.1% Black), Martindale (0.5% Black), Kyle (4.5% Black), Staples (0% Black), and Uhland (2.3% Black).

San Marcos's Asian Population

1,501 residents of San Marcos, or 2.1% of the population, identify as Asian. The share of Asian residents in San Marcos is slightly lower than in Texas overall, where 5.5% of the population is Asian. San Marcos ranks 187th statewide in terms of Asian residents as a share of the population, out of 1,863 places.

Since the 2020 Census, San Marcos's Asian population has declined by an estimated 22.2%. Asian residents' share of San Marcos's population has decreased from 2.9% to 2.1%.

San Marcos is more Asian than neighboring Redwood (0% Asian), Martindale (0% Asian), Kyle (1% Asian), Staples (0% Asian), and Uhland (0.1% Asian).

San Marcos's Hispanic Population

29,933 residents of San Marcos, or 42.2% of the population, identify as Hispanic. The share of Hispanic residents in San Marcos is slightly higher than in Texas overall, where 39.7% of the population is Hispanic. San Marcos ranks 734th statewide in terms of Hispanic residents as a share of the population, out of 1,863 places.

Since the 2020 Census, San Marcos's Hispanic population has grown by an estimated 9.1%. Hispanic residents' share of San Marcos's population has increased from 40.6% to 42.2%.

San Marcos is more Hispanic than neighboring Staples (33.7% Hispanic). San Marcos is less Hispanic than neighboring Redwood (84.8% Hispanic), Martindale (59.2% Hispanic), Kyle (51.8% Hispanic), and Uhland (67.5% Hispanic).

San Marcos's Native American/Other Population

1,397 residents of San Marcos, or 2.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in San Marcos is comparable to the share in Texas overall, where 0.6% of the population is Native American/Other. San Marcos ranks 828th statewide in terms of Native American/Other residents as a share of the population, out of 1,863 places.

Since the 2020 Census, San Marcos's Native American/Other population has grown by an estimated 198.5%. Native American/Other residents' share of San Marcos's population has increased from 0.7% to 2.0%.

San Marcos is more Native American/Other than neighboring Redwood (0.3% Native American/Other), Martindale (0% Native American/Other), Kyle (0.6% Native American/Other), and Staples (0% Native American/Other). San Marcos is less Native American/Other than neighboring Uhland (11.5% Native American/Other).

San Marcos's Multiracial Population

2,751 residents of San Marcos, or 3.9% of the population, identify as Multiracial. The share of Multiracial residents in San Marcos is comparable to the share in Texas overall, where 3.1% of the population is Multiracial. San Marcos ranks 52nd statewide in terms of Multiracial residents as a share of the population, out of 1,863 places.

Since the 2020 Census, San Marcos's Multiracial population has declined by an estimated 42.0%. Multiracial residents' share of San Marcos's population has decreased from 7.0% to 3.9%.

San Marcos is more Multiracial than neighboring Redwood (0.2% Multiracial), Martindale (1.7% Multiracial), Kyle (3.1% Multiracial), and Uhland (0.6% Multiracial). San Marcos is less Multiracial than neighboring Staples (17.7% 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.