ZIP Codes of Washington County, TX

Population & People
Population & People
Total Population
36,591
Household Income
Household Income
Median Income
$88,652
Housing
Housing
Total Housing Units
17,624
Business & Economy
Business & Economy
Total Businesses
998
Employment
Employment
Employment Rate
56.57%
Education
Education
Bachelor's Degree+
30.84%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 5 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:5 ZIP Codes (4 Standard, 1 PO Box, 0 Unique) [See All]
Area Codes:936 / 979
Timezone:Central (GMT -06:00)
Local Time:2:14:04 PM
Population:36,591 [See All]
FIPS:48477
CBSA:Brenham, TX
Land Area:640 sq mi
Water Area:18 sq mi
Coordinates:30.1916, -96.3646
Quick Link:
https://www.zip-codes.com/county/tx-washington.asp
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Texas's #87 most populous county
36,591 residents across 5 ZIPs — #87 of 254 Texas counties.

Standout ZIPs in this County


Most Populous
Brenham · 29,498 people
80.6% of county total
Highest Income
Burton · $109,917 median
1.2× county average
Largest Land Area
Brenham · 318.3 sq mi
Spans the most ground
Fastest Growth
Washington · 100.4% (10-yr)
1,256 → 2,517 residents
Most Educated
Chappell Hill · 33.2% bachelor's+
519 of 1,564 adults 25+

Things worth knowing about Washington County


36,591 residents live across 5 ZIPs covering 640 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 34,429 to 36,591 from 2014 to 2024 — a +6.3% change. 4 ZIPs gained residents, 0 lost.

The county's wealthiest ZIP 77835 (Burton, $109,917 median) and poorest ZIP 77833 (Brenham, $73,388) are 14.7 miles apart — a 1.5× income gap across local geography.

Median home values vary 2.2× across this county — from $270,800 in 77880 (Washington) to $592,300 in 77426 (Chappell Hill).

Density varies across the county — from 21 people/sq mi in 77835 (Burton) to 93 in 77833 (Brenham).

Educational attainment ranges from 20.3% bachelor's+ in 77835 (Burton) to 33.2% in 77426 (Chappell Hill) — the breadth of educational profiles across the area.

Within Texas, this is the #87 most populous of 254 counties and ranks #27 for median household income with the #80 fastest decade growth .

Weighted by population, the typical household earns about $77,541 across the county — reflecting what a typical resident sees, not a simple ZIP average.

30.8% of adults age 25+ hold a bachelor's degree or higher (7,674 of 24,886 reporting).

4 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Washington 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
640
square miles
Avg density
57.2
people per sq mi
Population
36,591
across 5 ZIPs
Brenham
318.3 sq mi
29,498 residents
Burton
124.0 sq mi
2,569 residents
Washington
105.3 sq mi
2,517 residents

Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Brenham

All ZIP Codes in Washington County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
77833BrenhamStandard29,498$73,388318.31.6%
77835BurtonStandard2,569$109,917124.018.7%
77880WashingtonStandard2,517$90,856105.3100.4%
77426Chappell HillStandard2,007$80,44692.31.6%
77834BrenhamPO Box0.0

Adjacent & Nearby Counties