Founded in May 1, 1803, Montgomery County is one of 88 counties in the state of Ohio. Historically, Montgomery County was formed from Hamilton and Wayne Counties. The city of Dayton is the county seat. With FIPS code of 113, Montgomery County has a population of 535,840 and area of 461.68 square miles (1,196 km2).
List of all cities in Montgomery County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Beavercreek, OH | 45410 | 937 |
| 45430 | 937 | |
| 45440 | 937 | |
| Brookville, OH | 45309 | 937 |
| Centerville, OH | 45440 | 937 |
| 45458 | 937 | |
| 45459 | 937 | |
| Chautauqua, OH | 45342 | 937 |
| Clayton, OH | 45315 | 937 |
| Dayton, OH | 45400 | 937 |
| 45401 | 937 | |
| 45402 | 937 | |
| 45403 | 937 | |
| 45404 | 937 | |
| 45405 | 937 | |
| 45406 | 937 | |
| 45408 | 937 | |
| 45409 | 937 | |
| 45410 | 937 | |
| 45412 | 937 | |
| 45413 | 937 | |
| 45414 | 937 | |
| 45415 | 937 | |
| 45416 | 937 | |
| 45417 | 937 | |
| 45418 | 937 | |
| 45419 | 937 | |
| 45420 | 937 | |
| 45422 | 937 | |
| 45423 | 937 | |
| 45424 | 937 | |
| 45426 | 937 | |
| 45427 | 937 | |
| 45428 | 937 | |
| 45429 | 937 | |
| 45430 | 937 | |
| 45437 | 937 | |
| 45439 | 937 | |
| 45440 | 937 | |
| 45441 | 937 | |
| 45448 | 937 | |
| 45449 | 937 | |
| 45454 | 937 | |
| 45458 | 937 | |
| 45459 | 937 | |
| 45463 | 937 | |
| 45469 | 937 | |
| 45470 | 937 | |
| 45475 | 937 | |
| 45479 | 937 | |
| 45481 | 937 | |
| 45482 | 937 | |
| 45490 | 937 | |
| Dayton Business Reply Mail, OH | 45482 | 937 |
| Dayton Courtesy Reply Mail, OH | 45481 | 937 |
| Drexel, OH | 45427 | 937 |
| Elder Beerman, OH | 45454 | 937 |
| Englewood, OH | 45315 | 937 |
| 45322 | 937 | |
| Farmersville, OH | 45325 | 937 |
| Germantown, OH | 45325 | 937 |
| 45327 | 937 | |
| Huber, OH | 45424 | 937 |
| Huber Heights, OH | 45424 | 937 |
| Kettering, OH | 45409 | 937 |
| 45419 | 937 | |
| 45420 | 937 | |
| 45429 | 937 | |
| 45430 | 937 | |
| 45439 | 937 | |
| 45440 | 937 | |
| 45459 | 937 | |
| Mead World Headquarters, OH | 45463 | 937 |
| Metropolitan Life, OH | 45448 | 937 |
| Metropolitan Medical Claims, OH | 45470 | 937 |
| Miamisburg, OH | 45342 | 937 |
| 45343 | 937 | |
| Moraine, OH | 45409 | 937 |
| 45418 | 937 | |
| 45439 | 937 | |
| 45459 | 937 | |
| National City Bank, OH | 45412 | 937 |
| New Lebanon, OH | 45345 | 937 |
| Northridge, OH | 45413 | 937 |
| 45414 | 937 | |
| Oakwood, OH | 45409 | 937 |
| 45419 | 937 | |
| Phillipsburg, OH | 45354 | 937 |
| Trotwood, OH | 45406 | 937 |
| 45415 | 937 | |
| 45416 | 937 | |
| 45418 | 937 | |
| 45426 | 937 | |
| 45427 | 937 | |
| Union, OH | 45322 | 937 |
| University of Dayton, OH | 45469 | 937 |
| Vandalia, OH | 45377 | 937 |
| Veterans Administration, OH | 45428 | 937 |
| Washington Township, OH | 45440 | 937 |
| 45458 | 937 | |
| 45459 | 937 | |
| 45475 | 937 | |
| West Carrollton, OH | 45439 | 937 |
| 45449 | 937 |