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 |
|---|---|---|---|---|---|---|---|
| Youngstown | 1 | 58,847 | 59,890 | -0.44% | 1,734 | 33.9 | City |
| Austintown | 2 | 30,517 | 29,467 | 0.2% | 2,627 | 11.6 | CDP |
| Struthers | 3 | 9,876 | 10,035 | -0.4% | 2,712 | 3.6 | City |
| Campbell | 4 | 7,715 | 7,835 | -0.39% | 2,076 | 3.7 | City |
| Canfield | 5 | 7,587 | 7,677 | -0.3% | 1,486 | 5.1 | City |
| Champion Heights | 6 | 6,322 | 6,354 | -0.19% | 756 | 8.4 | CDP |
| Sebring | 7 | 4,121 | 4,177 | -0.34% | 1,652 | 2.5 | Village |
| Lordstown | 8 | 3,320 | 3,323 | -0.03% | 143 | 23.2 | Village |
| McDonald | 9 | 3,116 | 3,166 | -0.41% | 1,834 | 1.7 | Village |
| Poland | 10 | 2,412 | 2,454 | -0.45% | 1,476 | 1.6 | Village |
| Woodworth | 11 | 2,236 | 1,530 | 7.66% | 724 | 3.1 | CDP |
| New Middletown | 12 | 1,482 | 1,501 | -0.34% | 1,698 | 0.9 | Village |
| North Lima | 13 | 1,286 | 1,341 | 7.7% | 188 | 6.9 | CDP |
| Craig Beach | 14 | 1,059 | 1,074 | -0.38% | 1,351 | 0.8 | Village |
| South Canal | 15 | 998 | 901 | -0.8% | 591 | 1.7 | CDP |
| Lowellville | 16 | 984 | 1,000 | -0.4% | 723 | 1.4 | Village |
| Beloit | 17 | 888 | 902 | -0.45% | 911 | 1.0 | Village |
| Hilltop | 18 | 673 | 639 | 1.51% | 896 | 0.8 | CDP |
| New Springfield | 19 | 663 | 359 | 7.8% | 420 | 1.6 | CDP |
| Lake Milton | 20 | 547 | 541 | 7.68% | 368 | 1.5 | CDP |
| Petersburg | 21 | 396 | 472 | 7.9% | 261 | 1.5 | CDP |
| Maplewood Park | 22 | 274 | 283 | -0.36% | 347 | 0.8 | CDP |
| Damascus | 23 | 158 | 286 | -11.73% | 198 | 0.8 | CDP |
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.
Youngstown is the largest city in Mahoning County.
Damascus is the smallest city in Mahoning County.
There are 23 cities in Mahoning County, Ohio.