'Montgomery County, OH' definitions:

Montgomery -- U.S. County in Ohio

From: Gazetteer 2000
Name :
Montgomery -- U.S. County in Ohio
Population (2000) :
559062
Housing Units (2000) :
248443
Land area (2000) :
461.675942 sq. miles (1195.735149 sq. km)
Water area (2000) :
2.668011 sq. miles (6.910116 sq. km)
Total area (2000) :
464.343953 sq. miles (1202.645265 sq. km)
Located within :
Ohio (OH), FIPS 39
Location :
39.750258 N, 84.218590 W