Montgomery County | |
|---|---|
 Current Montgomery County Courthouse | |
 Flag  Seal  Logo | |
 Location within the U.S. state of Ohio | |
 Ohio's location within the U.S. | |
| Coordinates: 39°45′N 84°17′W / 39.75°N 84.29°W | |
| Country |  United States |
| State |  Ohio |
| Founded | May 1, 1803[1] |
| Named for | Richard Montgomery |
| Seat | Dayton |
| Largest city | Dayton |
| Area | |
| • Total | 464 sq mi (1,200 km2) |
| • Land | 462 sq mi (1,200 km2) |
| • Water | 2.8 sq mi (7 km2) 0.6% |
| Population (2020) | |
| • Total | 537,309 |
| • Estimate (2021) | 535,840  |
| • Density | 1,200/sq mi (450/km2) |
| Time zone | UTC−5 (Eastern) |
| • Summer (DST) | UTC−4 (EDT) |
| Congressional district | 10th |
| Website | www |
Montgomery County is in the southwestern part of the U.S. state of Ohio. At the 2020 census, the population was 537,309,[2] making it the fifth-most populous county in Ohio. The county seat is Dayton.[3] 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.[4] Montgomery County is part of the Dayton, Ohio, Metropolitan Statistical Area.
- ^ "Ohio County Profiles: Montgomery County" (PDF). Ohio Department of Development. Archived from the original (PDF) on May 8, 2007. Retrieved April 28, 2007.
- ^ "State & County QuickFacts". United States Census Bureau. Retrieved June 29, 2022.
- ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
- ^ "Montgomery County data". Ohio State University Extension Data Center. Archived from the original on March 27, 2008. Retrieved April 28, 2007.