ZIP Codes of Gillespie County, TX

Population & People
Population & People
Total Population
28,067
Household Income
Household Income
Median Income
$74,999
Housing
Housing
Total Housing Units
14,699
Business & Economy
Business & Economy
Total Businesses
1,203
Employment
Employment
Employment Rate
53.12%
Education
Education
Bachelor's Degree+
35.94%
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 (5 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:830
Timezone:Central (GMT -06:00)
Local Time:2:13:55 PM
Population:28,067 [See All]
FIPS:48171
CBSA:Fredericksburg, TX
Land Area:1,333 sq mi
Water Area:3 sq mi
Coordinates:30.3460, -98.9466
Quick Link:
https://www.zip-codes.com/county/tx-gillespie.asp
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Texas's #98 most populous county
28,067 residents across 5 ZIPs — #98 of 254 Texas counties.

Standout ZIPs in this County


Most Populous
Fredericksburg · 23,741 people
84.6% of county total
Highest Income
Doss · $81,528 median
1.1× county average
Largest Land Area
Fredericksburg · 774.1 sq mi
Spans the most ground
Fastest Growth
Harper · 47.9% (10-yr)
2,343 → 3,465 residents
Most Educated
Fredericksburg · 38.0% bachelor's+
6,761 of 17,777 adults 25+

Things worth knowing about Gillespie County


28,067 residents live across 5 ZIPs covering 1,333 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 25,013 to 28,067 from 2014 to 2024 — a +12.2% change. 3 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 78618 (Doss, $81,528 median) and poorest ZIP 78671 (Stonewall, $61,200) are 37.3 miles apart — a 1.3× income gap across local geography.

Median home values vary 1.3× across this county — from $349,300 in 78618 (Doss) to $463,300 in 78624 (Fredericksburg).

Density varies 13× across the county — from 2 people/sq mi in 78618 (Doss) to 31 in 78624 (Fredericksburg).

Educational attainment ranges from 24.0% bachelor's+ in 78631 (Harper) to 38.0% in 78624 (Fredericksburg) — the breadth of educational profiles across the area.

Within Texas, this is the #98 most populous of 254 counties and ranks #77 for median household income with the #54 fastest decade growth .

Weighted by population, the typical household earns about $75,530 across the county — reflecting what a typical resident sees, not a simple ZIP average.

35.9% of adults age 25+ hold a bachelor's degree or higher (7,604 of 21,160 reporting).

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

Stories about Gillespie 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
1,333
square miles
Avg density
21.1
people per sq mi
Population
28,067
across 5 ZIPs
Fredericksburg
774.1 sq mi
23,741 residents
Harper
318.6 sq mi
3,465 residents
Doss
146.5 sq mi
346 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.

Fredericksburg

All ZIP Codes in Gillespie County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
78624FredericksburgStandard23,741$75,237774.19.8%
78631HarperStandard3,465$78,560318.647.9%
78671StonewallStandard413$61,20050.3-32.2%
78618DossStandard346$81,528146.531.6%
78675Willow CityStandard102$78,47243.5-39.6%

Adjacent & Nearby Counties