'Madison County, VA' definitions:

Madison -- U.S. County in Virginia

From: Gazetteer 2000
Name :
Madison -- U.S. County in Virginia
Population (2000) :
12520
Housing Units (2000) :
5239
Land area (2000) :
321.421373 sq. miles (832.477500 sq. km)
Water area (2000) :
0.362127 sq. miles (0.937905 sq. km)
Total area (2000) :
321.783500 sq. miles (833.415405 sq. km)
Located within :
Virginia (VA), FIPS 51
Location :
38.417878 N, 78.263130 W