San Marcos city, Texas Demographics & Population 2026

Population Overview

San Marcos city is a mid-sized community located in Texas. The total population is 68,920. It ranks as the 59th most populous out of 1,800 cities and towns in Texas.

Age Demographics

The median age in San Marcos city is 25.5 years. This is 28% lower than the state median of 35.5 years. Only 12.3% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in San Marcos city is $51,030. This is 33% lower than the state median of $76,292. Compared to the national median of $78,538, household income here is 35% lower. The poverty rate stands at 26.7%. This is 93% higher than the state poverty rate of 13.8%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The unemployment rate is 6.1%. This is 18% higher than the state rate of 5.1%. The median home value is $269,700. Housing costs are 4% higher than the state median of $260,400. The home-value-to-income ratio is 5.3x. 30.5% of occupied housing units are owner-occupied. This homeownership rate is 51% lower than the state average of 62.6%.

Race & Ethnicity

The largest racial or ethnic group in San Marcos city is White (non-Hispanic), making up 45.4% of the population. Hispanic or Latino residents account for 41.9%. The Black or African American population (5.3%) is well below the state average of 11.9%. The Asian population (2.1%) is well below the state average of 5.3%.

Education

37.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 13% higher than the state rate of 33.1%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 90.9%. Notably, 15.3% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for San Marcos city, Texas is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Texas state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,800 Census-designated places in Texas. For official data, visit data.census.gov.