Montgomery County, Ohio

Montgomery County
Current Montgomery County Courthouse
Current Montgomery County Courthouse
Flag of Montgomery County
Official seal of Montgomery County
Official logo of Montgomery County
Map of Ohio highlighting Montgomery County
Location within the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location within the U.S.
Coordinates: 39°45′N 84°17′W / 39.75°N 84.29°W / 39.75; -84.29
Country United States
State Ohio
FoundedMay 1, 1803[1]
Named forRichard Montgomery
SeatDayton
Largest cityDayton
Area
 • Total464 sq mi (1,200 km2)
 • Land462 sq mi (1,200 km2)
 • Water2.8 sq mi (7 km2)  0.6%
Population
 (2020)
 • Total537,309
 • Estimate 
(2021)
535,840 Decrease
 • Density1,200/sq mi (450/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district10th
Websitewww.mcohio.org

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.

  1. ^ "Ohio County Profiles: Montgomery County" (PDF). Ohio Department of Development. Archived from the original (PDF) on May 8, 2007. Retrieved April 28, 2007.
  2. ^ "State & County QuickFacts". United States Census Bureau. Retrieved June 29, 2022.
  3. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  4. ^ "Montgomery County data". Ohio State University Extension Data Center. Archived from the original on March 27, 2008. Retrieved April 28, 2007.