ZIP Codes of Union County, SC

Population & People
Population & People
Total Population
26,688
Household Income
Household Income
Median Income
$45,214
Housing
Housing
Total Housing Units
13,327
Business & Economy
Business & Economy
Total Businesses
401
Employment
Employment
Employment Rate
49.45%
Education
Education
Bachelor's Degree+
13.72%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 6 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:6 ZIP Codes (4 Standard, 1 PO Box, 1 Unique) [See All]
Area Codes:821 / 864
Timezone:Eastern (GMT -05:00)
Local Time:11:55:00 PM
Population:26,688 [See All]
FIPS:45087
CBSA:Spartanburg, SC
Land Area:506 sq mi
Water Area:2 sq mi
Coordinates:34.7485, -81.5994
Quick Link:
https://www.zip-codes.com/county/sc-union.asp
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South Carolina's #34 most populous county
26,688 residents across 6 ZIPs — #34 of 46 South Carolina counties.

Standout ZIPs in this County


Most Populous
Union · 17,607 people
66.0% of county total
Highest Income
Jonesville · $64,494 median
1.4× county average
Largest Land Area
Union · 247.1 sq mi
Spans the most ground
Fastest Growth
Buffalo · 33.5% (10-yr)
2,424 → 3,236 residents
Most Educated
Buffalo · 17.2% bachelor's+
370 of 2,153 adults 25+

Things worth knowing about Union County


26,688 residents live across 6 ZIPs covering 506 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 27,104 to 26,688 from 2014 to 2024 — a -1.5% change. 2 ZIPs gained residents, 3 lost.

The county's wealthiest ZIP 29353 (Jonesville, $64,494 median) and poorest ZIP 29364 (Lockhart, $25,089) are 14.2 miles apart — a 2.6× income gap across local geography.

Median home values vary 5.1× across this county — from $22,900 in 29364 (Lockhart) to $116,800 in 29353 (Jonesville).

Density varies 236× across the county — from 13 people/sq mi in 29031 (Carlisle) to 2,980 in 29364 (Lockhart).

Educational attainment ranges from 6.5% bachelor's+ in 29031 (Carlisle) to 17.2% in 29321 (Buffalo) — the breadth of educational profiles across the area.

Within South Carolina, this is the #34 most populous of 46 counties and ranks #42 for median household income .

Hosts 1 single-entity Unique ZIP: 29395Disney Direct Marketing .

Weighted by population, the typical household earns about $44,254 across the county — reflecting what a typical resident sees, not a simple ZIP average.

13.7% of adults age 25+ hold a bachelor's degree or higher (2,651 of 19,329 reporting).

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

Stories about Union 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
506
square miles
Avg density
52.8
people per sq mi
Population
26,688
across 6 ZIPs
Union
247.1 sq mi
17,607 residents
Carlisle
128.3 sq mi
1,617 residents
Jonesville
89.8 sq mi
3,675 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.

Union

All ZIP Codes in Union County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
29379UnionStandard17,607$40,879247.1-5.4%
29353JonesvilleStandard3,675$64,49489.8-10.1%
29321BuffaloStandard3,236$34,46440.333.5%
29031CarlisleStandard1,617$61,143128.320.8%
29364LockhartPO Box553$25,0890.2-14.0%
29395JonesvilleUnique0.0

Adjacent & Nearby Counties