Ohio's County Almanac
Lists population figures, institutions of higher education, land, people, and places to visit for each of Ohio's 88 counties.

County Population Estimates - U.S. Census Bureau
Provides population, demographic, and housing information for the state and each county.

ODNR Recreation Areas
Ohio Department of Natural Resources, recreational areas by county.

Color Landform Atlas: Ohio Counties
Provides a shaded relief map depicting counties in Ohio.