67 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Ashtabula township | 1 | 19,328 | 19,583 | -0.15% | 955 | 20.24 | Township |
| Ashtabula | 2 | 17,660 | 17,972 | -0.35% | 2,292 | 7.71 | City |
| Jefferson township | 3 | 13,733 | 14,390 | -0.83% | 930 | 14.77 | Township |
| Jefferson township | 4 | 13,726 | 13,832 | -0.12% | 408 | 33.66 | Township |
| Conneaut | 5 | 12,397 | 12,304 | 0.15% | 473 | 26.20 | City |
| Geneva township | 6 | 10,024 | 10,124 | -0.09% | 389 | 25.74 | Township |
| Saybrook township | 7 | 9,582 | 9,708 | -0.16% | 302 | 31.77 | Township |
| Rome township | 8 | 8,269 | 8,764 | -0.95% | 245 | 33.69 | Township |
| North Madison | 9 | 8,254 | 8,685 | -0.24% | 2,113 | 3.91 | CDP |
| Jefferson township | 10 | 8,203 | 7,226 | 3.91% | 194 | 42.38 | Township |
| Jefferson township | 11 | 6,148 | 5,867 | 1.77% | 242 | 25.39 | Township |
| Geneva | 12 | 5,830 | 5,919 | -0.31% | 1,459 | 4 | City |
| Jefferson township | 13 | 5,258 | 5,330 | -0.17% | 204 | 25.83 | Township |
| Jefferson township | 14 | 4,954 | 4,915 | 0.14% | 136 | 36.34 | Township |
| Edgewood | 15 | 4,368 | 4,382 | -0.09% | 642 | 6.80 | CDP |
| Jefferson township | 16 | 3,483 | 3,496 | -0.06% | 95 | 36.59 | Township |
| Jefferson township | 17 | 3,200 | 3,225 | 0.06% | 91 | 35.05 | Township |
| Jefferson | 18 | 3,162 | 3,216 | -0.35% | 1,269 | 2.49 | Village |
| Orwell township | 19 | 3,068 | 3,083 | 0.03% | 129 | 23.86 | Township |
| Jefferson township | 20 | 3,032 | 3,050 | -0.13% | 81 | 37.63 | Township |
| North Kingsville | 21 | 2,703 | 2,747 | -0.33% | 303 | 8.93 | Village |
| Windsor township | 22 | 2,616 | 2,647 | -0.11% | 106 | 24.76 | Township |
| Jefferson township | 23 | 2,573 | 2,618 | -0.31% | 42 | 61.01 | Township |
| Andover township | 24 | 2,558 | 2,533 | 0.31% | 115 | 22.24 | Township |
| Harpersfield township | 25 | 2,544 | 2,557 | 0% | 99 | 25.70 | Township |
| Jefferson township | 26 | 2,488 | 2,580 | -0.56% | 102 | 24.47 | Township |
| Morgan township | 27 | 2,263 | 2,276 | 0.04% | 95 | 23.75 | Township |
| Jefferson township | 28 | 2,204 | 765 | 16.12% | 67 | 32.69 | Township |
| Austinburg township | 29 | 2,167 | 2,198 | -0.23% | 87 | 24.85 | Township |
| Windsor township | 30 | 1,911 | 2,014 | -0.78% | 49 | 38.97 | Township |
| Windsor township | 31 | 1,876 | 1,907 | -0.27% | 44 | 42.50 | Township |
| Jefferson township | 32 | 1,846 | 1,832 | 0.38% | 901 | 2.05 | Township |
| Rome township | 33 | 1,843 | 1,865 | -0.16% | 78 | 23.55 | Township |
| Jefferson township | 34 | 1,789 | 1,819 | -0.11% | 43 | 41.92 | Township |
| Kingsville township | 35 | 1,636 | 1,651 | -0.06% | 126 | 12.96 | Township |
| Hartsgrove township | 36 | 1,599 | 1,617 | -0.19% | 64 | 24.80 | Township |
| Roaming Shores | 37 | 1,562 | 1,586 | -0.32% | 722 | 2.16 | Village |
| Jefferson township | 38 | 1,547 | 1,562 | 0.06% | 82 | 18.81 | Township |
| Orwell | 39 | 1,506 | 1,518 | -0.13% | 748 | 2.01 | Village |
| Jefferson township | 40 | 1,502 | 1,452 | 1.08% | 57 | 26.32 | Township |
| Sheffield township | 41 | 1,484 | 1,493 | 0% | 64 | 23.30 | Township |
| Williamsfield township | 42 | 1,438 | 1,452 | -0.14% | 57 | 25.14 | Township |
| Saybrook-on-the-Lake | 43 | 1,390 | 1,068 | 7.17% | 447 | 3.11 | CDP |
| Jefferson township | 44 | 1,381 | 1,378 | 0.07% | 58 | 23.69 | Township |
| Lenox township | 45 | 1,375 | 1,383 | 0% | 57 | 24.28 | Township |
| Trumbull township | 46 | 1,341 | 1,360 | -0.22% | 52 | 25.60 | Township |
| Jefferson township | 47 | 1,308 | 1,313 | 0.08% | 57 | 23.11 | Township |
| Rome township | 48 | 1,212 | 1,248 | -0.57% | 33 | 36.52 | Township |
| Pierpont township | 49 | 1,158 | 1,154 | 0.26% | 41 | 28.02 | Township |
| Jefferson township | 50 | 1,149 | 1,134 | 0.35% | 40 | 28.78 | Township |
| Colebrook township | 51 | 1,100 | 1,111 | -0.09% | 45 | 24.57 | Township |
| Jefferson township | 52 | 1,033 | 1,039 | 0% | 42 | 24.55 | Township |
| New Lyme township | 53 | 1,031 | 1,036 | 0.1% | 42 | 24.83 | Township |
| Andover | 54 | 937 | 954 | -0.32% | 675 | 1.39 | Village |
| Jefferson township | 55 | 928 | 949 | -0.11% | 41 | 22.37 | Township |
| Geneva-on-the-Lake | 56 | 927 | 941 | -0.32% | 388 | 2.39 | Village |
| Kingsville | 57 | 921 | 663 | 7.09% | 334 | 2.75 | CDP |
| Cherry Valley township | 58 | 920 | 929 | -0.11% | 38 | 24.06 | Township |
| Jefferson township | 59 | 907 | 902 | 0.11% | 21 | 43.07 | Township |
| North Perry | 60 | 904 | 914 | -0.22% | 233 | 3.88 | Village |
| Kinsman Center | 61 | 872 | 660 | 1.99% | 397 | 2.20 | CDP |
| Denmark township | 62 | 816 | 816 | 0.12% | 34 | 24.35 | Township |
| Dorset township | 63 | 799 | 809 | -0.13% | 35 | 22.96 | Township |
| Rock Creek | 64 | 651 | 665 | -0.46% | 741 | 0.88 | Village |
| Austinburg | 65 | 461 | 577 | -0.86% | 140 | 3.28 | CDP |
| Jefferson township | 66 | 213 | 209 | 0.47% | 9 | 23.65 | Township |
| Jefferson township | 67 | 73 | 74 | 0% | 3 | 22.57 | Township |
Ashtabula township is the largest city in Ashtabula County, with a population of 19,328.
Jefferson township is the smallest city in Ashtabula County.
There are 67 cities in Ashtabula County, Ohio.