Marion 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 66,217 people, with a population density of about 163.90 persons per square mile.
The county spans a total land area of 404.00 square miles (1,046.00 square kilometers). The administrative center and county seat is Marion, which often serves as a hub for local governance and services. The largest city within the county by population is Marion.
Geographically, Marion County experiences varied elevations, with its highest point at Caledonia 998 ft and its lowest point at Prospect 905 ft. The region operates in the UTC-5.