Your Guide to Montgomery County, Ohio
Looking for trusted businesses, services and local resources in Montgomery County, Ohio? FindItOhio.com helps residents and visitors discover local companies, professionals and community information across Montgomery County, including Dayton, the county seat.
Quick answer: Montgomery County is one of Ohio’s 88 counties. Its county seat is Dayton, it was established in 1803, and it has an estimated 539,598 residents as of 2025.
At a Glance
- County seat: Dayton
- Established: May 1, 1803
- Formed from: Hamilton and Wayne Counties
- Named for: General Richard Montgomery (1738 to 1775), a Revolutionary War officer
- Estimated population (2025): 539,598
- Total area: 461.68 sq mi
- FIPS code: 39113
About Montgomery County
Montgomery County is in the southwestern part of the U.S. state of Ohio. At the 2020 census, the population was 537,309, making it the fifth most populous county in Ohio. The county seat is Dayton. The county was named in honor of Richard Montgomery, an American Revolutionary War general, who was killed in 1775 while attempting to capture Quebec City, Canada. Montgomery County is part of the Dayton, Ohio, Metropolitan Statistical Area.
Cities and Villages in Montgomery County
Cities
Brookville, Carlisle, Centerville, Clayton, Englewood, Germantown, Huber Heights, Kettering, Miamisburg, Moraine, Oakwood, Riverside, Springboro, Trotwood, Union, Vandalia, West Carrollton
Villages
Farmersville, New Lebanon, Phillipsburg, Verona
Find Local Businesses in Montgomery County
Browse the FindItOhio.com business directory to find restaurants, contractors, professional services, shops and more serving Montgomery 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 Montgomery 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 Montgomery County, Ohio?
Dayton is the county seat of Montgomery County, Ohio.
When was Montgomery County established?
Montgomery County was established on May 1, 1803. It was formed from Hamilton and Wayne Counties.
Who or what is Montgomery County named for?
Montgomery County is named for General Richard Montgomery (1738 to 1775), a Revolutionary War officer.
How many people live in Montgomery County, Ohio?
Montgomery County has an estimated population of 539,598 as of 2025.
What cities are in Montgomery County, Ohio?
Cities in Montgomery County include Brookville, Carlisle, Centerville, Clayton, Englewood, Germantown, Huber Heights, Kettering and others.
Where can I find local businesses in Montgomery County?
Search the FindItOhio.com business directory to find local businesses and services in Montgomery County, Ohio.
How do I list my Montgomery 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 Montgomery County, Ohio, available under the Creative Commons Attribution ShareAlike 4.0 license.