'St. Charles County' definitions:
St. Charles -- U.S. County in Missouri
From: Gazetteer 2000
Name :
St. Charles -- U.S. County in Missouri
Population (2000) :
283883
Housing Units (2000) :
105514
Land area (2000) :
560.421380 sq. miles (1451.484650 sq. km)
Water area (2000) :
31.927059 sq. miles (82.690700 sq. km)
Total area (2000) :
592.348439 sq. miles (1534.175350 sq. km)
Located within :
Missouri (MO), FIPS 29
Location :
38.784300 N, 90.651859 W