There are 20 cities in Ottawa County, Ohio.
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 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Fremont | 1 | 15,782 | 15,902 | -0.19% | 1,852 | 8.5 | City |
| Port Clinton | 2 | 5,905 | 6,017 | -0.47% | 2,771 | 2.1 | City |
| Ballville | 3 | 3,745 | 3,537 | 1.49% | 828 | 4.5 | CDP |
| Oak Harbor | 4 | 2,792 | 2,820 | -0.25% | 1,759 | 1.6 | Village |
| Genoa | 5 | 2,182 | 2,224 | -0.5% | 1,367 | 1.6 | Village |
| Woodville | 6 | 1,979 | 2,002 | -0.3% | 1,468 | 1.3 | Village |
| Stony Prairie | 7 | 1,798 | 1,632 | 2.04% | 1,121 | 1.6 | CDP |
| Curtice | 8 | 1,497 | 1,251 | -0.13% | 406 | 3.7 | CDP |
| Elmore | 9 | 1,366 | 1,396 | -0.58% | 1,477 | 0.9 | Village |
| Millbury | 10 | 1,199 | 1,189 | 0.17% | 1,204 | 1.0 | Village |
| Marblehead | 11 | 835 | 851 | -0.48% | 263 | 3.2 | Village |
| Reno Beach | 12 | 698 | 615 | 7.72% | 563 | 1.2 | CDP |
| Lakeside | 13 | 570 | 686 | -1.55% | 828 | 0.7 | CDP |
| Lindsey | 14 | 453 | 456 | -0.22% | 290 | 1.6 | Village |
| Williston | 15 | 334 | 419 | -3.19% | 547 | 0.6 | CDP |
| Rocky Ridge | 16 | 307 | 310 | -0.33% | 306 | 1.0 | Village |
| Clay Center | 17 | 248 | 260 | -1.2% | 245 | 1.0 | Village |
| Put-in-Bay | 18 | 150 | 153 | -0.66% | 342 | 0.4 | Village |
| Hessville | 19 | 34 | 84 | -27.66% | 49 | 0.7 | CDP |
| Wightmans Grove | 20 | 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.
Fremont is the largest city in Ottawa County.
Wightmans Grove is the smallest city in Ottawa County.
There are 20 cities in Ottawa County, Ohio.