
Sunbury
- County:
- Northumberland County
- County Seat:
- Yes
- Area (mi²):
- 2.007
- State:
- Pennsylvania
Sunbury is a city located in Northumberland County, Pennsylvania. Sunbury has a 2025 population of 9,429. It is also the county seat of .Sunbury is currently declining at a rate of -0.58% annually and its population has decreased by -2.83% since the most recent census, which recorded a population of 9,704 in 2020.
The average household income in Sunbury is $62,852 with a poverty rate of 16.19%. The median age in Sunbury is 41.4 years: 37.9 years for males, and 45.1 years for females.