ZIP Codes of Lamar County, GA

Population & People
Population & People
Total Population
18,204
Household Income
Household Income
Median Income
$65,373
Housing
Housing
Total Housing Units
7,336
Business & Economy
Business & Economy
Total Businesses
273
Employment
Employment
Employment Rate
53.75%
Education
Education
Bachelor's Degree+
19.34%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 2 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:2 ZIP Codes (2 Standard, 0 PO Box, 0 Unique) [See All]
Area Codes:470 / 678 / 770 / 943
Timezone:Eastern (GMT -05:00)
Local Time:11:53:03 PM
Population:18,204 [See All]
FIPS:13171
Land Area:169 sq mi
Water Area:2 sq mi
Coordinates:33.1024, -84.1702
Quick Link:
https://www.zip-codes.com/county/ga-lamar.asp
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Georgia's #95 most populous county
18,204 residents across 2 ZIPs — #95 of 161 Georgia counties.

Standout ZIPs in this County


Most Populous
Barnesville · 13,616 people
74.8% of county total
Highest Income
Milner · $67,941 median
1.0× county average
Largest Land Area
Barnesville · 127.4 sq mi
Spans the most ground
Fastest Growth
Barnesville · 7.6% (10-yr)
12,652 → 13,616 residents
Most Educated
Barnesville · 20.5% bachelor's+
1,891 of 9,238 adults 25+

Things worth knowing about Lamar County


18,204 residents live across 2 ZIPs covering 169 sq mi, served by 2 distinct USPS-recognized cities.

Population moved from 17,382 to 18,204 from 2014 to 2024 — a +4.7% change. 1 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 30257 (Milner, $67,941 median) and poorest ZIP 30204 (Barnesville, $62,805) are 6.5 miles apart — a 1.1× income gap across local geography.

Median home values vary 1.3× across this county — from $188,900 in 30204 (Barnesville) to $245,100 in 30257 (Milner).

Density varies across the county — from 107 people/sq mi in 30204 (Barnesville) to 109 in 30257 (Milner).

Educational attainment ranges from 16.1% bachelor's+ in 30257 (Milner) to 20.5% in 30204 (Barnesville) — the breadth of educational profiles across the area.

Within Georgia, this is the #95 most populous of 161 counties and ranks #61 for median household income .

Weighted by population, the typical household earns about $64,099 across the county — reflecting what a typical resident sees, not a simple ZIP average.

19.3% of adults age 25+ hold a bachelor's degree or higher (2,409 of 12,453 reporting).

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

Stories about Lamar County


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.

Barnesville

All ZIP Codes in Lamar County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
30204BarnesvilleStandard13,616$62,805127.47.6%
30257MilnerStandard4,588$67,94142.0-3.0%

Adjacent & Nearby Counties