'Boone County, IL' definitions:

Boone -- U.S. County in Illinois

From: Gazetteer 2000
Name :
Boone -- U.S. County in Illinois
Population (2000) :
41786
Housing Units (2000) :
15414
Land area (2000) :
281.265189 sq. miles (728.473464 sq. km)
Water area (2000) :
0.676395 sq. miles (1.751854 sq. km)
Total area (2000) :
281.941584 sq. miles (730.225318 sq. km)
Located within :
Illinois (IL), FIPS 17
Location :
42.298948 N, 88.834228 W