County ZIP codes · Pennsylvania · FIPS 42119
Union County, PA ZIP Codes
Union County, Pennsylvania has 15 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 14 residential and 1 for PO boxes or a single organization. 11 of the residential ones lie mainly in Union County and 3 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $66,510 in 17845 (Millmont) to $91,661 in 17856 (New Columbia) (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 $68,314 and $88,975.
They carry 14 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 14 residential ZIP codes in Union County
11 ZIP codes lie mainly in Union County; 3 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 17837 | Lewisburg | 18,403 | 328 | $89k | $288k | 100% |
| 17844 | Mifflinburg | 10,291 | 97 | $68k | $235k | 100% |
| 17856 | New Columbia | 3,167 | 65 | $92k | $198k | 100% |
| 17845 | Millmont | 2,058 | 33 | $67k | $197k | 100% |
| 17855 | New Berlin | 1,014 | 523 | $89k | $217k | 100% |
| 17886 | West Milton | 804 | 1,023 | $48k | $174k | 100% |
| 17887 | White Deer | 591 | 3,604 | – | $160k | 100% |
| 17829 | Hartleton | 212 | 293 | $80k | $138k | 100% |
| 17885 | Weikert | 181 | 14 | $93k | $342k | 100% |
| 17835 | Laurelton | 114 | 1,281 | $49k | $158k | 100% |
| 17880 | Swengel | 29 | 674 | $62k | – | 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?
3 ZIP codes of Union County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Union | Elsewhere |
|---|---|---|
| 17870 | 2% | Snyder County 98% |
| 17810 | 26% | Lycoming County 74% |
| 17889 | 41% | Snyder County 59% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 17883 | Vicksburg |
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. Every ZIP code of Union County starts with 178.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 178 | Harrisburg, PA (SCF 170) | 15 | 60 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.