Your Guide to Warren County, Ohio
Looking for trusted businesses, services and local resources in Warren County, Ohio? FindItOhio.com helps residents and visitors discover local companies, professionals and community information across Warren County, including Lebanon, the county seat.
Quick answer: Warren County is one of Ohio’s 88 counties. Its county seat is Lebanon, it was established in 1803, and it has an estimated 257,181 residents as of 2025.
At a Glance
- County seat: Lebanon
- Established: May 1, 1803
- Formed from: Hamilton County
- Named for: General Joseph Warren (1741 to 1775), a Revolutionary War officer
- Estimated population (2025): 257,181
- Total area: 399.63 sq mi
- FIPS code: 39165
About Warren County
Warren County is a county located in the southwestern part of the U.S. state of Ohio. As of the 2020 census, the population was 242,337. Its county seat is Lebanon and most populous city is Mason. The county is one of Ohio’s most affluent, with the second highest median income of the state’s 88 counties. The county was established on May 1, 1803, from Hamilton County; it is named for Dr. Joseph Warren, a hero of the Revolution who sent Paul Revere and the overlooked William Dawes on their famous rides and who died at the Battle of Bunker Hill. Warren County is part of the Cincinnati, OH KY IN Metropolitan Statistical Area.
History of Warren County
Warren County was established in 1803. The first non Native American settlers were migrants from New England. During the election of 1860 Abraham Lincoln received 60% of the vote in Warren County, and in 1864 he was reelected with 70% of the vote in the county. From that time on the county was a stronghold of the Republican party, with Ulysses S. Grant going on to carry the county by large margins in both 1868 and 1872.
Cities and Villages in Warren County
Cities
Carlisle, Franklin, Lebanon †, Loveland, Mason, Middletown, Monroe, South Lebanon, Springboro
Villages
Blanchester, Butlerville, Corwin, Harveysburg, Maineville, Morrow, Pleasant Plain, Waynesville
Find Local Businesses in Warren County
Browse the FindItOhio.com business directory to find restaurants, contractors, professional services, shops and more serving Warren County. Own a business here? Add your free business listing so local customers can find you.
Background Checks, Process Serving and Private Investigations
Residents and employers in Warren County can get BCI and FBI LiveScan fingerprinting, FD-258 fingerprint cards, process serving and licensed private investigations from these Ohio providers:
- Ohio Security & Investigations, Youngstown: licensed private investigations and fingerprinting. Call (888) 341-6960 or visit ohioinvestigators.com.
- 10-8 Protective Services, Columbus: investigations, fingerprinting and process serving. Call (800) 949-8521 or visit 10-8protectiveservices.com.
Frequently Asked Questions
What is the county seat of Warren County, Ohio?
Lebanon is the county seat of Warren County, Ohio.
When was Warren County established?
Warren County was established on May 1, 1803. It was formed from Hamilton County.
Who or what is Warren County named for?
Warren County is named for General Joseph Warren (1741 to 1775), a Revolutionary War officer.
How many people live in Warren County, Ohio?
Warren County has an estimated population of 257,181 as of 2025.
What cities are in Warren County, Ohio?
Cities in Warren County include Carlisle, Franklin, Lebanon †, Loveland, Mason, Middletown, Monroe, South Lebanon and others.
Where can I find local businesses in Warren County?
Search the FindItOhio.com business directory to find local businesses and services in Warren County, Ohio.
How do I list my Warren County business on FindItOhio.com?
Visit the free business listing page on FindItOhio.com and submit your business name, address, phone number and website.
Looking for another county? Explore all 88 Ohio counties on FindItOhio.com.
County background adapted from the Wikipedia article Warren County, Ohio, available under the Creative Commons Attribution ShareAlike 4.0 license.