
West Middlesex
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 0.845
- State:
- Pennsylvania
West Middlesex is a borough located in Mercer County, Pennsylvania. West Middlesex has a 2025 population of 780. West Middlesex is currently declining at a rate of -0.89% annually and its population has decreased by -4.29% since the most recent census, which recorded a population of 815 in 2020.
The average household income in West Middlesex is $85,674 with a poverty rate of 2.35%. The median age in West Middlesex is 43.2 years: 43.2 years for males, and 43.1 years for females.