Champaign County is a county located in the U.S. state of Ohio. As of the most recent data available, the county has a population of approximately 38,890 people, with a population density of about 90.65 persons per square mile.
The county spans a total land area of 429.00 square miles (1,111.00 square kilometers). The administrative center and county seat is Urbana, which often serves as a hub for local governance and services. The largest city within the county by population is Urbana.
Geographically, Champaign County experiences varied elevations, with its highest point at St. Paris 1,200 ft and its lowest point at Mechanicsburg 0 ft. The region operates in the UTC-5.