ZIP Codes of Duval County, TX

Population & People
Population & People
Total Population
10,464
Household Income
Household Income
Median Income
$47,962
Housing
Housing
Total Housing Units
4,666
Business & Economy
Business & Economy
Total Businesses
156
Employment
Employment
Employment Rate
43.28%
Education
Education
Bachelor's Degree+
8.24%
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 Code:361
Timezone:Central (GMT -06:00)
Local Time:2:13:53 PM
Population:10,464 [See All]
FIPS:48131
Land Area:1,495 sq mi
Water Area:2 sq mi
Coordinates:27.6025, -98.4840
Quick Link:
https://www.zip-codes.com/county/tx-duval.asp
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Notable population decline
Lost 18.9% of residents since 2014.

Standout ZIPs in this County


Most Populous
San Diego · 5,747 people
54.9% of county total
Highest Income
Freer · $68,000 median
1.4× county average
Largest Land Area
Freer · 426.9 sq mi
Spans the most ground
Fastest Growth
San Diego · -8.0% (10-yr)
6,245 → 5,747 residents
Most Educated
Benavides · 10.8% bachelor's+
118 of 1,095 adults 25+

Things worth knowing about Duval County


10,464 residents live across 5 ZIPs covering 1,495 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 12,898 to 10,464 from 2014 to 2024 — a -18.9% change. 0 ZIPs gained residents, 5 lost.

The county's wealthiest ZIP 78357 (Freer, $68,000 median) and poorest ZIP 78349 (Concepcion, $38,235) are 37.8 miles apart — a 1.8× income gap across local geography.

Median home values vary 2.0× across this county — from $76,100 in 78341 (Benavides) to $153,600 in 78349 (Concepcion).

Density varies 59× across the county — from 0 people/sq mi in 78376 (Realitos) to 17 in 78384 (San Diego).

Educational attainment ranges from 3.7% bachelor's+ in 78349 (Concepcion) to 13.3% in 78376 (Realitos) — the breadth of educational profiles across the area.

Within Texas, this is the #160 most populous of 254 counties and ranks #238 for median household income .

Weighted by population, the typical household earns about $51,909 across the county — reflecting what a typical resident sees, not a simple ZIP average.

8.2% of adults age 25+ hold a bachelor's degree or higher (568 of 6,896 reporting).

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

Stories about Duval 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
1,495
square miles
Avg density
7.0
people per sq mi
Population
10,464
across 5 ZIPs
Freer
426.9 sq mi
2,624 residents
Realitos
371.2 sq mi
105 residents
San Diego
344.8 sq mi
5,747 residents

Population decline

Duval County lost 18.9% of residents between 2014 and 2024. ZIPs that shed the largest share:

Realitos
-87.8%
859 → 105 residents
Benavides
-34.5%
2,365 → 1,550 residents
Freer
-11.2%
2,954 → 2,624 residents

All ZIP Codes in Duval County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
78384San DiegoStandard5,747$47,603344.8-8.0%
78357FreerStandard2,624$68,000426.9-11.2%
78341BenavidesPO Box1,550$45,259173.1-34.5%
78349ConcepcionStandard438$38,235179.0-7.8%
78376RealitosStandard105$40,714371.2-87.8%

Adjacent & Nearby Counties