'Mercer County, PA' definitions:
Mercer -- U.S. County in Pennsylvania
From: Gazetteer 2000
Name :
Mercer -- U.S. County in Pennsylvania
Population (2000) :
120293
Housing Units (2000) :
49859
Land area (2000) :
671.815970 sq. miles (1739.995300 sq. km)
Water area (2000) :
10.757464 sq. miles (27.861703 sq. km)
Total area (2000) :
682.573434 sq. miles (1767.857003 sq. km)
Located within :
Pennsylvania (PA), FIPS 42
Location :
41.294427 N, 80.313128 W