
Eau Claire
- County:
- Butler County
- County Seat:
- No
- Area (mi²):
- 1.275
- State:
- Pennsylvania
Eau Claire is a borough located in Butler County, Pennsylvania. Eau Claire has a 2025 population of 293. Eau Claire is currently declining at a rate of -1.01% annually and its population has decreased by -4.87% since the most recent census, which recorded a population of 308 in 2020.
The average household income in Eau Claire is $60,471 with a poverty rate of 15.42%. The median age in Eau Claire is 48.1 years: 47.4 years for males, and 56.5 years for females.