
Williamstown
- County:
- Dauphin County
- County Seat:
- No
- Area (mi²):
- 0.259
- State:
- Pennsylvania
Williamstown is a borough located in Dauphin County, Pennsylvania. Williamstown has a 2025 population of 1,285. Williamstown is currently declining at a rate of -0.31% annually and its population has decreased by -1.46% since the most recent census, which recorded a population of 1,304 in 2020.
The average household income in Williamstown is $66,255 with a poverty rate of 22.16%. The median age in Williamstown is 40.8 years: 41.8 years for males, and 39.4 years for females.