County Maps US

McMullen County, Texas

A county in Texas, ranked 251 of 254 by population.

CountyFIPS 48311Sparse data

Within Texas
McMullen County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Tilden, the county seat, located via the 2025 Census Gazetteer.

Download SVGFull Texas map downloads

Population
544
-54 (-9.0%) since 2020
Land area
1,140
square miles. A further 1.5% of the total area is water
Population density
0.48
people per square mile, computed rather than published
County seat
Tilden
Seat of county government.
Established
1877
148 years ago
Largest city
Not available
No incorporated place lies within this county.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of McMullen County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of McMullen County, Texas from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 585 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where McMullen County ranks

Position among the 254 counties of Texas, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn TexasNationally
Population544251st of 2543,137th of 3,144
Land area1,140 sq mi43rd of 254546th of 3,144
Population density0.48 per sq mi250th of 2543,118th of 3,144
Median household income$43,875242nd of 2542,991st of 3,143

Full data for McMullen County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population544Vintage 2025 Population Estimates
Population in 2020598Vintage 2025 Population Estimates
2020 estimates base?601Vintage 2025 Population Estimates
Land area1,140 sq mi2025 Gazetteer Files
Water area17.0 sq mi2025 Gazetteer Files
Total area1,157 sq mi2025 Gazetteer Files
Population density?0.48 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$43,875American Community Survey 2020-2024 5-Year Estimates
Median home value$97,100American Community Survey 2020-2024 5-Year Estimates
Median age31.8American Community Survey 2020-2024 5-Year Estimates
Households207American Community Survey 2020-2024 5-Year Estimates
Housing units348American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-6
7 births, 13 deaths
Net migration
-9
More people moved out than moved in.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering McMullen County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
La Salle CountyTexas41 mi6,517
Live Oak CountyTexas38 mi11,929
Atascosa CountyTexas31 mi53,590
Duval CountyTexas29 mi9,402
Webb CountyTexasa single point281,224

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 254 counties of Texas

Open the interactive Texas county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.