McMullen County, Texas Demographics 2026

Population Overview

McMullen County is located in Texas with a total population of 623. It is the 251st most populous county out of 254 in Texas. The county encompasses 1 Census-designated place.

Age Demographics

The median age in McMullen County is 32.6 years. This is 8% lower than the state median of 35.5 years. With 38.0% of the population under 18, McMullen County has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in McMullen County is $45,833. This is 40% lower than the state median of $76,292. It is also 42% lower than the national median of $78,538. The poverty rate stands at 9.2%. This is 34% lower than the state poverty rate of 13.8%. The unemployment rate is 0.0%. This is 100% lower than the state rate of 5.1%. The median home value is $108,800. Housing costs are 58% lower than the state median of $260,400. With a home-value-to-income ratio of just 2.4x, McMullen County is one of the most affordable housing markets in the area. 76.8% of occupied housing units are owner-occupied. This homeownership rate is 23% higher than the state average of 62.6%.

Race & Ethnicity

The largest racial or ethnic group in McMullen County is Hispanic or Latino, making up 54.4% of the population. White (non-Hispanic) residents account for 44.6%.

Education

15.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 55% lower 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 88.4%.

Data Sources & Methodology

All figures for McMullen County come from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023), with comparisons drawn against Texas and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.