Eau Claire is a borough in Butler County, Pennsylvania, United States. The population was 316 at the 2010 census. The name means "Clear Water" in French, and is pronounced as the French pronunciation.

Foxburg is a borough in Clarion County, Pennsylvania, United States. It is located along the east bank of the Allegheny River, about 2 miles (3 km) north of the mouth of the Clarion River. As of the 2020 census it had a population of 181.