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McMullen County, Texas

Updated November 1, 2026 · Data: U.S. Census Bureau

McMullen County, Texas has its county seat in Tilden and FIPS code 48311. About 623 people live here, the 251st most populated of the 254 Texas counties.

County seat	Tilden
FIPS code	48311 (Texas 48 + county 311) · all Texas FIPS codes
Population	623 (251st of 254)
Land area	1,139.8 sq mi (43rd largest; + 17.0 sq mi water)
People per sq mi	0.5
Time zone	Central time (America/Chicago)
Median home value	$108,800
Median property tax paid	$2,167 a year (about 1.99% of the median home value: our calculation, not an official rate)
Official website	mcmullencounty.org

What counties border McMullen County?

McMullen County shares a border with 4 counties:

What ZIP codes are in McMullen County?

7 ZIP code areas with residents touch McMullen County; the ones marked * cross into another county.

Check an exact address with the address lookup, look up a ZIP code, or see how to confirm your county with official records.

Sources: Census TIGER/Line 2024 (boundary, area, neighbors); ACS 2019-2023 5-year (population, home value, taxes paid); Wikidata, CC0 (seat, website); timezone-boundary-builder (time zone). Data as of November 1, 2026. Not affiliated with any government agency.

FAQ

Frequently asked questions

What is the county seat of McMullen County, Texas?

Tilden.

What is the FIPS code for McMullen County?

48311. The first two digits (48) are Texas; the last three (311) are the county.

What counties border McMullen County?

Atascosa County, Duval County, La Salle County, Live Oak County.

How many people live in McMullen County?

About 623 (ACS 2019-2023 5-year estimate), the 251st most of the 254 Texas counties.

What time zone is McMullen County in?

Central time (America/Chicago).

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