
Dauphin County
- State:
- Pennsylvania
- County Seat:
- Harrisburg
Dauphin County's estimated 2025 population is 290,328 with a growth rate of 0.19% in the past year according to the most recent United States census data. Dauphin County is the 14th largest county in Pennsylvania. The 2010 population was 268,289 and has seen a growth of 8.21% since that time.