'Union County, NJ' definitions:

Union -- U.S. County in New Jersey

From: Gazetteer 2000
Name :
Union -- U.S. County in New Jersey
Population (2000) :
522541
Housing Units (2000) :
192945
Land area (2000) :
103.289164 sq. miles (267.517696 sq. km)
Water area (2000) :
2.171768 sq. miles (5.624852 sq. km)
Total area (2000) :
105.460932 sq. miles (273.142548 sq. km)
Located within :
New Jersey (NJ), FIPS 34
Location :
40.657752 N, 74.301654 W