Montgomery County Flag

Montgomery County

State:
Ohio
County Seat:
Dayton

Montgomery County's estimated 2025 population is 539,573 with a growth rate of 0.4% in the past year according to the most recent United States census data. Montgomery County is the 5th largest county in Ohio. The 2010 population was 535,620 and has seen a growth of 0.74% since that time.

539,573
Total Population
1,170
Population Density (mi²)
5
Population Rank (State)
2.1K 0.4%
Annual Population Growth

Montgomery County Population

Demographics

Economics and Income Statistics

Sources

  1. City and Town Population Totals: 2020-2024
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)