County ZIP codes · North Carolina · FIPS 37179
Union County, NC ZIP Codes
Union County, North Carolina has 12 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 11 residential and 1 for PO boxes or a single organization. 8 of the residential ones lie mainly in Union County and 3 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $46,549 in 28133 (Peachland) to $150,597 in 28173 (Waxhaw) (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 $76,924 and $105,122.
They carry 9 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 11 residential ZIP codes in Union County
8 ZIP codes lie mainly in Union County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 28173 | Waxhaw | 65,274 | 614 | $151k | $608k | 100% |
| 28110 | Monroe | 56,971 | 447 | $84k | $343k | 100% |
| 28079 | Indian Trail | 43,035 | 923 | $101k | $396k | 100% |
| 28104 | Matthews | 36,641 | 1,238 | $138k | $534k | 97% |
| 28112 | Monroe | 28,461 | 215 | $81k | $297k | 100% |
| 28103 | Marshville | 10,714 | 70 | $77k | $248k | 98% |
| 28174 | Wingate | 9,573 | 263 | $71k | $227k | 100% |
| 28108 | Mineral Springs | 34 | 166 | – | – | 100% |
Partly in Union County
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 |
|---|---|---|
| 28105 | 1% | Mecklenburg County 99% |
| 28104 | 97% | Mecklenburg County 3% |
| 28103 | 98% | Anson County 3% |
| 28107 | 3% | Cabarrus County 92%; Mecklenburg County 4%; Stanly County 2% |
| 28133 | 4% | Anson County 96% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 28111 | Monroe |
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 2 prefixes: 280 and 281.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.