ZIP Codes of Austin County, TX

Population & People
Population & People
Total Population
34,344
Household Income
Household Income
Median Income
$84,038
Housing
Housing
Total Housing Units
15,374
Business & Economy
Business & Economy
Total Businesses
741
Employment
Employment
Employment Rate
58.04%
Education
Education
Bachelor's Degree+
25.08%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 9 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:9 ZIP Codes (7 Standard, 2 PO Box, 0 Unique) [See All]
Area Codes:281 / 346 / 832 / 979
Timezone:Central (GMT -06:00)
Local Time:2:13:50 PM
Population:34,344 [See All]
FIPS:48015
CBSA:Houston-Pasadena-The Woodlands, TX
Land Area:767 sq mi
Water Area:11 sq mi
Coordinates:29.8810, -96.3057
Quick Link:
https://www.zip-codes.com/county/tx-austin.asp
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Texas's #88 most populous county
34,344 residents across 9 ZIPs — #88 of 254 Texas counties.

Standout ZIPs in this County


Most Populous
Sealy · 15,146 people
44.1% of county total
Highest Income
Industry · $126,806 median
1.5× county average
Largest Land Area
Sealy · 225.6 sq mi
Spans the most ground
Fastest Growth
Sealy · 17.7% (10-yr)
12,867 → 15,146 residents
Most Educated
Bellville · 37.9% bachelor's+
2,583 of 6,816 adults 25+

Things worth knowing about Austin County


34,344 residents live across 9 ZIPs covering 767 sq mi, served by 9 distinct USPS-recognized cities.

Population moved from 31,123 to 34,344 from 2014 to 2024 — a +10.3% change. 6 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 78944 (Industry, $126,806 median) and poorest ZIP 77485 (Wallis, $51,742) are 35.7 miles apart — a 2.5× income gap across local geography.

Median home values vary 1.7× across this county — from $224,700 in 77485 (Wallis) to $384,100 in 78944 (Industry).

Density varies across the county — from 11 people/sq mi in 78931 (Bleiblerville) to 67 in 77474 (Sealy).

Educational attainment ranges from 13.2% bachelor's+ in 77485 (Wallis) to 37.9% in 77418 (Bellville) — the breadth of educational profiles across the area.

Within Texas, this is the #88 most populous of 254 counties and ranks #34 for median household income with the #64 fastest decade growth .

Weighted by population, the typical household earns about $78,719 across the county — reflecting what a typical resident sees, not a simple ZIP average.

25.1% of adults age 25+ hold a bachelor's degree or higher (5,920 of 23,608 reporting).

7 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Austin County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
767
square miles
Avg density
44.8
people per sq mi
Population
34,344
across 9 ZIPs
Sealy
225.6 sq mi
15,146 residents
Bellville
187.4 sq mi
10,171 residents
New Ulm
116.9 sq mi
2,300 residents

All ZIP Codes in Austin County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
77474SealyStandard15,146$75,272225.617.7%
77418BellvilleStandard10,171$90,611187.48.1%
77485WallisStandard4,378$51,742100.314.7%
78950New UlmStandard2,300$91,354116.9-22.1%
78933Cat SpringStandard1,395$68,444105.513.1%
78944IndustryStandard720$126,80614.616.5%
78931BleiblervilleStandard18516.423.3%
77473San FelipePO Box490.0-41.0%
77452KenneyPO Box0.0

Adjacent & Nearby Counties