Founded in Mar 1, 1807, Miami County is one of 88 counties in the state of Ohio. Historically, Miami County was formed from Montgomery County. The city of Troy is the county seat. With FIPS code of 109, Miami County has a population of 109,264 and area of 407.04 square miles (1,054 km2).
List of all cities in Miami County, OH alphabetically
| City/Town | Postal Code | Area Code |
| Bradford, OH | 45308 | 937 |
| Casstown, OH | 45312 | 937 |
| Conover, OH | 45317 | 937 |
| Covington, OH | 45318 | 937 |
| Fletcher, OH | 45326 | 937 |
| Laura, OH | 45337 | 937 |
| Lena, OH | 45317 | 937 |
| Ludlow Falls, OH | 45339 | 937 |
| P Hill, OH | 45359 | 937 |
| Phoneton, OH | 45371 | 937 |
| Piqua, OH | 45356 | 937 |
| Pleasant Hill, OH | 45359 | 937 |
| Pmi, OH | 45374 | 937 |
| Potsdam, OH | 45361 | 937 |
| Tipp, OH | 45371 | 937 |
| Troy, OH | 45373 | 937 |
| 45374 | 937 | |
| West Milton, OH | 45383 | 937 |