| Capital: | Sunbury |
|---|---|
| Origen y Formación del condado: | Parts of Lancaster, Berks, Bedford, Cumberland, and Northampton Counties. |
| Población: | 94,528 habitantes |
| Área: | 477 sq mi |
| Localización del condado dentro de Pennsylvania: |
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Localidades en Northumberland, Pennsylvania
- Coal Township
- Dalmatia
- Delaware Township Northumberland County
- Dewart
- Dornsife
- East Cameron Township
- East Chillisquaque Township
- Edgewood Northumberland County
- Elysburg
- Excelsior
- Fairview Ferndale
- Happy Valley
- Herndon
- Jackson Township Northumberland County
- Jordan Township Northumberland County
- Kapp Heights
- Kulpmont
- Leck Kill
- Lewis Township Northumberland County
- Little Mahanoy Township
- Locust Gap
- Lower Mahanoy Township
- Marion Heights
- Marshallton
- Mcewensville
- Milton
- Montandon
- Mount Carmel
- Northumberland
- Paxinos
- Point Township
- Ralpho Township
- Ranshaw
- Rebuck
- Riverside
- Rockefeller Township
- Rush Township Northumberland County
- Shamokin
- Shamokin Township
- Snydertown Northumberland County
- Sunbury
- Tharptown (Uniontown)
- Trevorton
- Turbotville
- Turbot Township
- Upper Mahanoy Township
- Washington Township Northumberland County
- Watsontown
- West Cameron Township
- West Chillisquaque Township
- Zerbe Township