County ZIP codes · South Carolina · FIPS 45087
Union County, SC ZIP Codes
Union County, South Carolina has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 9 residential and 1 for PO boxes or a single organization. 4 of the residential ones lie mainly in Union County and 5 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $34,464 in 29321 (Buffalo) to $78,397 in 29374 (Pauline) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Union County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $40,879 and $61,143.
They carry 9 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 9 residential ZIP codes in Union County
4 ZIP codes lie mainly in Union County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 29379 | Union | 17,607 | 73 | $41k | $110k | 100% |
| 29353 | Jonesville | 3,675 | 40 | $65k | $117k | 100% |
| 29321 | Buffalo | 3,236 | 82 | $35k | $60k | 100% |
| 29364 | Lockhart | 553 | 710 | $25k | $23k | 100% |
Partly in Union County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 29031 | Carlisle | 1,617 | 13 | $61k | $93k | 44% |
| 29178 | Whitmire | 3,280 | 23 | $60k | $73k | 37% |
| 29372 | Pacolet | 3,552 | 83 | $47k | $104k | 26% |
| 29335 | Enoree | 5,472 | 57 | $53k | $123k | 14% |
| 29374 | Pauline | 3,079 | 63 | $78k | $247k | 10% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
5 ZIP codes of Union County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Union | Elsewhere |
|---|---|---|
| 29335 | 14% | Spartanburg County 67%; Laurens County 19% |
| 29372 | 26% | Cherokee County 42%; Spartanburg County 32% |
| 29178 | 37% | Newberry County 50%; Laurens County 13% |
| 29374 | 10% | Spartanburg County 90% |
| 29031 | 44% | Chester County 50%; Fairfield County 6% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 29395 | Jonesville |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Union County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Union County's ZIP codes use 3 prefixes: 290, 291 and 293.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 290 | Columbia, SC (SCF 290) | 1 | 53 |
| 291 | Columbia, SC (SCF 290) | 1 | 53 |
| 293 | Greenville, SC (SCF 296) | 8 | 53 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.