Montgomery County, Ohio
Montgomery County is a county in Ohio. Its county FIPS code is 39113. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 39113
- Representative coordinates
- 39.753736, -84.290591
- County type
- County
- County seat or government
- Dayton
- Resident population, July 2025
- 539,598
- Land area
- 1,194.897 km²
- Water area
- 7.492 km²
- State
- Ohio
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Montgomery County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/New_York | UTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
45005 · 45042 · 45066 · 45309 · 45315 · 45322 · 45325 · 45327 · 45342 · 45344 · 45345 · 45354 · 45371 · 45377 · 45378 · 45381 · 45402 · 45403 · 45404 · 45405 · 45406 · 45409 · 45410 · 45414 · 45415 · 45416 · 45417 · 45419 · 45420 · 45423 · 45424 · 45426 · 45428 · 45429 · 45431 · 45432 · 45439 · 45440 · 45449 · 45458 · 45459 · 45469
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Montgomery County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Brookville city, OH
- Carlisle city, OH
- Centerville city, OH
- Clayton city, OH
- Dayton city, OH
- Drexel CDP, OH
- Englewood city, OH
- Farmersville village, OH
- Fort McKinley CDP, OH
- Germantown city, OH
- Huber Heights city, OH
- Kettering city, OH
- Miamisburg city, OH
- Moraine city, OH
- New Lebanon village, OH
- Oakwood city, OH
- Phillipsburg village, OH
- Riverside city, OH
- Shiloh CDP, OH
- Springboro city, OH
- Trotwood city, OH
- Union city, OH
- Vandalia city, OH
- Verona village, OH
- West Carrollton city, OH
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.