20 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Dover | 1 | 40,387 | 39,407 | 0.49% | 1,696 | 24 | City |
| Smyrna | 2 | 13,415 | 12,967 | 0.67% | 2,093 | 6 | Town |
| Clayton | 3 | 4,641 | 3,989 | 2.88% | 2,382 | 2 | Town |
| Camden | 4 | 4,307 | 3,726 | 2.77% | 1,150 | 4 | Town |
| Harrington | 5 | 3,973 | 3,778 | 0.99% | 1,292 | 3 | City |
| Cheswold | 6 | 2,687 | 1,934 | 5.91% | 1,378 | 2 | Town |
| Wyoming | 7 | 1,912 | 1,707 | 2.19% | 1,826 | 1 | Town |
| Felton | 8 | 1,389 | 1,319 | 1.02% | 1,763 | 1 | Town |
| Frederica | 9 | 1,141 | 1,090 | 0.88% | 655 | 2 | Town |
| Houston | 10 | 407 | 389 | 0.74% | 1,063 | 0 | Town |
| Magnolia | 11 | 292 | 277 | 1.04% | 1,490 | 0 | Town |
| Bowers | 12 | 288 | 272 | 1.05% | 926 | 0 | Town |
| Slaughter Beach | 13 | 254 | 219 | 2.83% | 179 | 1 | Town |
| Kenton | 14 | 225 | 214 | 0.9% | 1,278 | 0 | Town |
| Little Creek | 15 | 205 | 194 | 0.99% | 2,071 | 0 | Town |
| Woodside | 16 | 200 | 188 | 1.01% | 1,190 | 0 | Town |
| Leipsic | 17 | 188 | 180 | 0.53% | 633 | 0 | Town |
| Viola | 18 | 146 | 140 | 0.69% | 825 | 0 | Town |
| Farmington | 19 | 102 | 90 | 2% | 1,397 | 0 | Town |
| Hartly | 20 | 80 | 70 | 2.56% | 1,404 | 0 | Town |
Dover is the largest city in Kent County, with a population of 40,387.
Hartly is the smallest city in Kent County, with a population of 80.
There are 20 cities in Kent County, Delaware.