Northumberland County, Pennsylvania
County seat: Sunbury · Population 89,920 (2025) · 458 sq mi
Northumberland County is the 32nd most populous of Pennsylvania's 67 counties, with 89,920 people (2025 estimate). Its county seat is Sunbury. It is part of the District 3 region, one of the 11 PennDOT engineering districts. The map shows its 13 cities and towns and the 9 neighboring counties.
Northumberland County facts
- County seat
- Sunbury
- Population (2025 estimate)
- 89,920 −1.9% since 2020
- Land area
- 458 sq mi 49th largest of 67
- Water area
- 20 sq mi
- Population density
- 197 per sq mi
- Established
- 1772
- Named after
- Northumberland ceremonial county and unitary authority area in north east England, UK
- Largest city
- Coal 9,721
- Median household income
- $60,583
- Cities and towns
- 13 plus 14 CDPs
- ZIP codes
- 28
- Time zone
- Eastern
- FIPS code
- 42097
Cities and towns in Northumberland County
Northumberland County has 13 incorporated cities, towns and villages. Populations count the people living inside Northumberland County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Sunbury (county seat) | City | 9,495 | |
| Shamokin | City | 6,764 | |
| Milton | Borough | 6,457 | |
| Mount Carmel | Borough | 5,579 | |
| Northumberland | Borough | 3,800 | |
| Kulpmont | Borough | 2,688 | |
| Watsontown | Borough | 2,188 | |
| Riverside | Borough | 1,991 | |
| Turbotville | Borough | 660 | |
| Marion Heights | Borough | 552 | |
| Herndon | Borough | 341 | |
| Snydertown | Borough | 316 | |
| McEwensville | Borough | 284 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Elysburg | 2,492 | |
| Edgewood | 2,078 | |
| Trevorton | 1,775 | |
| Fairview-Ferndale | 1,742 | |
| Dewart | 1,247 | |
| Marshallton | 1,187 | |
| Montandon | 831 | |
| Atlas | 719 | |
| Kapp Heights | 712 | |
| Ranshaw | 708 | |
| Uniontown | 358 | |
| Dalmatia | 341 | |
| Locust Gap | 188 | |
| Strong | 14 |
ZIP codes in Northumberland County
28 ZIP codes reach into Northumberland County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 17017 also Dauphin County
- 17730
- 17749
- 17756 also Lycoming, Montour and Columbia counties
- 17772 also Montour County
- 17777 also Montour County
- 17801
- 17821 also Montour and Columbia counties
- 17823
- 17824 also Columbia and Montour counties
- 17830
- 17832
- 17834
- 17836
- 17840
- 17847 also Montour County
- 17850
- 17851
- 17857
- 17860
- 17865
- 17866
- 17867
- 17868
- 17872
- 17881
- 17941 also Schuylkill County
- 17964 also Schuylkill County
Population of Northumberland County, 2020–2025
Northumberland County shrank by 1,726 people (−1.9%) between April 2020 and July 2025: 2,302 more deaths than births and a net gain of 539 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 91,544 |
| 2021 | 90,978 |
| 2022 | 90,075 |
| 2023 | 90,139 |
| 2024 | 89,969 |
| 2025 | 89,920 |
Neighboring counties
- Montour County north · 17,868 people
- Union County northwest · 42,313 people
- Snyder County west · 39,655 people
- Schuylkill County east · 145,085 people
- Dauphin County south · 293,351 people
- Columbia County northeast · 66,193 people
- Lycoming County northwest · 112,587 people
- Juniata County southwest · 23,403 people
- Perry County southwest · 46,806 people
Printable Northumberland County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (138 KB)
- PNG (2400 px) (129 KB)
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Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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