Your Guide to Knox County, Ohio
Looking for trusted businesses, services and local resources in Knox County, Ohio? FindItOhio.com helps residents and visitors discover local companies, professionals and community information across Knox County, including Mount Vernon, the county seat.
Quick answer: Knox County is one of Ohio’s 88 counties. Its county seat is Mount Vernon, it was established in 1808, and it has an estimated 64,002 residents as of 2025.
At a Glance
- County seat: Mount Vernon
- Established: Mar 1, 1808
- Formed from: Fairfield County
- Named for: General Henry Knox, the first Secretary of War
- Estimated population (2025): 64,002
- Total area: 527.12 sq mi
- FIPS code: 39083
About Knox County
Knox County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 62,721. Its county seat is Mount Vernon. The county is named for Henry Knox, an officer in the American Revolutionary War who was later the first Secretary of War. Knox County comprises the Mount Vernon, OH Micropolitan Statistical Area, which is also included in the Columbus Marion Zanesville, OH Combined Statistical Area.
Cities and Villages in Knox County
Cities
Mount Vernon â€
Villages
Centerburg, Danville, Fredericktown, Gambier, Gann, Martinsburg, Utica
Find Local Businesses in Knox County
Browse the FindItOhio.com business directory to find restaurants, contractors, professional services, shops and more serving Knox 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 Knox 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 Knox County, Ohio?
Mount Vernon is the county seat of Knox County, Ohio.
When was Knox County established?
Knox County was established on Mar 1, 1808. It was formed from Fairfield County.
Who or what is Knox County named for?
Knox County is named for General Henry Knox, the first Secretary of War.
How many people live in Knox County, Ohio?
Knox County has an estimated population of 64,002 as of 2025.
What cities are in Knox County, Ohio?
Cities in Knox County include Mount Vernon †.
Where can I find local businesses in Knox County?
Search the FindItOhio.com business directory to find local businesses and services in Knox County, Ohio.
How do I list my Knox 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 Knox County, Ohio, available under the Creative Commons Attribution ShareAlike 4.0 license.