COUNTY · PA
Northumberland County, Pennsylvania
Northumberland County is a county in Pennsylvania with FIPS code 42097 and an estimated population of 90,120 (Census 2023), 32nd largest of 67 in the state.
County facts
- Name
- Northumberland County
- State
- Pennsylvania
- Type
- county
- FIPS code
- 42097
- State FIPS
- 42
- Population (2023)
- 90,120
- Change since 2020
- -1.6%
- State rank
- 32 of 67
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Northumberland County?
Northumberland County, Pennsylvania has the five-digit FIPS code 42097: 42 for the state and 097 for the county.
What state is Northumberland County in?
Northumberland County is in Pennsylvania.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.