Union County, PA ZIP codes
There are 12 ZIP codes in Union County, PA, in 12 towns, from 17829 to 17887. The largest are 17837 (Lewisburg), 17844 (Mifflinburg) and 17856 (New Columbia).
The county seat is Lewisburg.
- ZIP codes
- 12
- Towns
- 12
- County seat
- Lewisburg
- County FIPS
42119- State
- Pennsylvania
- Population
- 42,456
- Median household income
- $76,404
- Land area
- 316 sq mi
- Metro area
- Lewisburg
Union County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Union County ZIP codes
The ZIP codes of Union County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Union County in numbers
About 42,456 people live in Union County, in 14,546 households, the 50th most populous of Pennsylvania's 67 counties. The median household income is $76,404 a year, about the same as the Pennsylvania median of $77,971 (US: $80,734). The median owner-occupied home is valued at $240,100 (6% below the Pennsylvania median), and median gross rent is $974 a month. The median age is 41.0; 26.5% of adults 25 and over hold a bachelor's degree or higher (35.2% across Pennsylvania); the average commute takes 18 minutes.
| Population | 42,456 |
|---|---|
| Households | 14,546 |
| Median age | 41.0 |
| Median household income | $76,404 |
| Median home value | $240,100 |
| Median gross rent | $974 |
| Bachelor's degree or higher | 26.5% |
| Mean commute | 17.9 min |
| Population density | 134 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Union County
| Town | ZIP codes | Population |
|---|---|---|
| Lewisburg | 1 | 5,257 |
| Mifflinburg | 1 | 3,473 |
| Millmont | 1 | 2,058 |
| West Milton | 1 | 804 |
| New Berlin | 1 | 781 |
| New Columbia | 1 | 766 |
| White Deer | 1 | 591 |
| Laurelton | 1 | 258 |
| Hartleton | 1 | 248 |
| Weikert | 1 | 181 |
| Vicksburg | 1 | 165 |
| Swengel | 1 | 29 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Union County.
Not sure you are in Union County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Union County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
17829 | Hartleton , PA | Standard | 212 | $80,417 | $137,500 |
17835 | Laurelton , PA | Standard | 114 | $48,611 | $158,300 |
17837 | Lewisburg , PA | Standard | 18,403 | $88,975 | $288,100 |
17844 | Mifflinburg , PA | Standard | 10,291 | $68,314 | $235,000 |
17845 | Millmont , PA | Standard | 2,058 | $66,510 | $197,200 |
17855 | New Berlin , PA | Standard | 1,014 | $88,929 | $216,700 |
17856 | New Columbia , PA | Standard | 3,167 | $91,661 | $197,600 |
17880 | Swengel , PA | Standard | 29 | $61,667 | — |
17883 | Vicksburg , PA | No street area | — | — | — |
17885 | Weikert , PA | Standard | 181 | $92,917 | $342,300 |
17886 | West Milton , PA | Standard | 804 | $47,574 | $174,200 |
17887 | White Deer , PA | Standard | 591 | — | $160,400 |
Cite this page
zipcodes.pro. “Union County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/pa/county/union
Underlying data is public domain or openly licensed — sources, vintages and licences.