36 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Columbus | 1 | 917,679 | 906,418 | 0.25% | 4,158 | 220.72 | City |
| Dublin | 2 | 48,643 | 49,343 | -0.29% | 1,971 | 24.68 | City |
| Grove City | 3 | 43,762 | 41,312 | 1.13% | 2,343 | 18.68 | City |
| Washington township | 4 | 42,677 | 43,618 | -0.41% | 1,784 | 23.92 | Township |
| Reynoldsburg | 5 | 41,333 | 41,050 | 0.14% | 3,649 | 11.33 | City |
| Mifflin township | 6 | 37,690 | 38,325 | 0% | 2,628 | 14.34 | Township |
| Hilliard | 7 | 37,345 | 37,137 | 0.11% | 2,616 | 14.27 | City |
| Upper Arlington | 8 | 35,064 | 36,761 | -0.96% | 3,580 | 9.79 | City |
| Gahanna | 9 | 34,795 | 35,705 | -0.52% | 2,799 | 12.43 | City |
| Truro township | 10 | 30,104 | 30,404 | -0.1% | 4,141 | 7.27 | Township |
| Whitehall | 11 | 19,475 | 20,104 | -0.64% | 3,690 | 5.28 | City |
| Prairie township | 12 | 16,561 | 17,430 | -0.92% | 891 | 18.58 | Township |
| Sharon township | 13 | 16,501 | 17,185 | -0.94% | 1,934 | 8.53 | Township |
| Worthington | 14 | 14,304 | 14,786 | -0.67% | 2,615 | 5.47 | City |
| Plain township | 15 | 13,020 | 12,754 | 0.35% | 653 | 19.95 | Township |
| Bexley | 16 | 12,039 | 13,904 | -3.01% | 4,973 | 2.42 | City |
| New Albany | 17 | 11,507 | 11,076 | 0.75% | 561 | 20.52 | City |
| Canal Winchester | 18 | 10,168 | 9,190 | 1.97% | 1,251 | 8.13 | City |
| Lincoln Village | 19 | 9,683 | 9,546 | 0.45% | 5,306 | 1.82 | CDP |
| Blendon township | 20 | 9,653 | 10,159 | -0.91% | 1,765 | 5.47 | Township |
| Grandview Heights | 21 | 9,237 | 8,246 | 2.19% | 7,024 | 1.31 | City |
| Obetz | 22 | 7,935 | 5,525 | 6.47% | 1,362 | 5.83 | Village |
| Pleasant township | 23 | 6,449 | 6,735 | -0.75% | 150 | 43.03 | Township |
| Groveport | 24 | 5,674 | 6,003 | -1.15% | 652 | 8.71 | City |
| Lake Darby | 25 | 4,563 | 4,133 | -0.04% | 1,318 | 3.46 | CDP |
| Brown township | 26 | 3,673 | 3,867 | -0.94% | 171 | 21.43 | Township |
| Dublin township | 27 | 2,052 | 2,080 | -0.15% | 55 | 37.33 | Township |
| Urbancrest | 28 | 973 | 1,030 | -1.12% | 1,658 | 0.59 | Village |
| Darbydale | 29 | 830 | 695 | 0.24% | 833 | 1 | CDP |
| Marble Cliff | 30 | 731 | 651 | 2.24% | 2,601 | 0.28 | Village |
| Valleyview | 31 | 633 | 667 | -1.09% | 4,427 | 0.14 | Village |
| Riverlea | 32 | 561 | 595 | -1.23% | 3,715 | 0.15 | Village |
| Harrisburg | 33 | 306 | 313 | -0.33% | 1,974 | 0.15 | Village |
| Harrisburg | 34 | 280 | 217 | 7.28% | 158 | 1.77 | CDP |
| Lockbourne | 35 | 223 | 237 | -1.33% | 284 | 0.79 | Village |
| Brice | 36 | 89 | 94 | -1.11% | 1,011 | 0.09 | Village |
Columbus is the largest city in Franklin County, with a population of 917,679.
Brice is the smallest city in Franklin County.
There are 36 cities in Franklin County, Ohio.