Fairfield 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 122,759 people, with a population density of about 242.61 persons per square mile.
The county spans a total land area of 506.00 square miles (1,311.00 square kilometers). The administrative center and county seat is Lancaster, which often serves as a hub for local governance and services. The largest city within the county by population is Lancaster.
Geographically, Fairfield County experiences varied elevations, with its highest point at Rushville 1,050 ft and its lowest point at Sugar Grove 0 ft. The region operates in the UTC-5.