Warren County Extension Office - Branch office of Ohio State University, it combines the needs of local citizens and communities, with new research and technical information. Warren County, Ohio - Official site providing government calendar, county history, job postings, and phone directory. Warren County Sheriff's Office - Provides details of the department including jails, staff and roadway information. Warren County Convention and Visitors Bureau - Includes information about local festivals and events, recreation, shopping, lodging, and attractions in the county. County Map - Ohio Department of Transportation map of Warren County roads and highways. Profile for Warren County - Information on the political infrastructure of the county.