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 |
|---|---|---|---|---|---|---|---|
| Port Clinton | 1 | 5,905 | 6,017 | -0.47% | 2,771 | 2.1 | City |
| Ballville | 2 | 3,745 | 3,537 | 1.49% | 828 | 4.5 | CDP |
| Oak Harbor | 3 | 2,792 | 2,820 | -0.25% | 1,759 | 1.6 | Village |
| Genoa | 4 | 2,182 | 2,224 | -0.5% | 1,367 | 1.6 | Village |
| Stony Prairie | 5 | 1,798 | 1,632 | 2.04% | 1,121 | 1.6 | CDP |
| Curtice | 6 | 1,497 | 1,251 | -0.13% | 406 | 3.7 | CDP |
| Elmore | 7 | 1,366 | 1,396 | -0.58% | 1,477 | 0.9 | Village |
| Marblehead | 8 | 835 | 851 | -0.48% | 263 | 3.2 | Village |
| Lakeside | 9 | 570 | 686 | -1.55% | 828 | 0.7 | CDP |
| Williston | 10 | 334 | 419 | -3.19% | 547 | 0.6 | CDP |
| Rocky Ridge | 11 | 307 | 310 | -0.33% | 306 | 1.0 | Village |
| Clay Center | 12 | 248 | 260 | -1.2% | 245 | 1.0 | Village |
| Put-in-Bay | 13 | 150 | 153 | -0.66% | 342 | 0.4 | Village |
| Wightmans Grove | 14 | 19 | 40 | 11.77% | 135 | 0.1 | 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.
Port Clinton is the largest city in Ottawa County.
Wightmans Grove is the smallest city in Ottawa County.
There are 14 cities in Ottawa County, Ohio.