COUNTY · OH
Montgomery County, Ohio
Montgomery County is a county in Ohio with FIPS code 39113 and an estimated population of 533,796 (Census 2023), 5th largest of 88 in the state.
County facts
- Name
- Montgomery County
- State
- Ohio
- Type
- county
- FIPS code
- 39113
- State FIPS
- 39
- Population (2023)
- 533,796
- Change since 2020
- -0.6%
- State rank
- 5 of 88
Population is the Census Bureau’s Vintage 2023 estimate.
Major cities in Montgomery County
Other counties in Ohio
Questions
What is the FIPS code for Montgomery County?
Montgomery County, Ohio has the five-digit FIPS code 39113: 39 for the state and 113 for the county.
What state is Montgomery County in?
Montgomery County is in Ohio.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.