Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Troy | 1 | 27,005 | 26,375 | 0.58% | 2,198 | 12.3 | City |
| Piqua | 2 | 20,860 | 20,408 | 0.55% | 1,609 | 13.0 | City |
| Tipp City | 3 | 10,546 | 10,297 | 0.59% | 1,313 | 8.0 | City |
| Union | 4 | 6,976 | 6,867 | 0.39% | 840 | 8.3 | City |
| West Milton | 5 | 4,837 | 4,708 | 0.67% | 1,426 | 3.4 | Village |
| Covington | 6 | 2,612 | 2,554 | 0.54% | 1,905 | 1.4 | Village |
| Bradford | 7 | 1,798 | 1,792 | 0.06% | 2,156 | 0.8 | Village |
| Pleasant Hill | 8 | 1,264 | 1,235 | 0.56% | 2,010 | 0.6 | Village |
| Fletcher | 9 | 459 | 453 | 0.22% | 1,476 | 0.3 | Village |
| Laura | 10 | 412 | 399 | 0.73% | 1,537 | 0.3 | Village |
| Casstown | 11 | 272 | 266 | 0.37% | 2,804 | 0.1 | Village |
| Potsdam | 12 | 221 | 224 | -0.45% | 496 | 0.4 | Village |
| Ludlow Falls | 13 | 177 | 173 | 0.57% | 989 | 0.2 | Village |
| Lockington | 14 | 156 | 160 | -0.64% | 1,857 | 0.1 | Village |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Troy is the largest city in Miami County.
Lockington is the smallest city in Miami County.
There are 14 cities in Miami County, Ohio.