20 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Dover | 1 | 40,583 | 39,407 | 0.49% | 1,704 | 24 | City |
| Smyrna | 2 | 13,505 | 12,967 | 0.67% | 2,107 | 6 | Town |
| Clayton | 3 | 4,772 | 3,989 | 2.82% | 2,450 | 2 | Town |
| Camden | 4 | 4,423 | 3,726 | 2.69% | 1,181 | 4 | Town |
| Harrington | 5 | 4,012 | 3,778 | 0.98% | 1,305 | 3 | City |
| Cheswold | 6 | 2,838 | 1,934 | 5.62% | 1,455 | 2 | Town |
| Wyoming | 7 | 1,953 | 1,707 | 2.14% | 1,865 | 1 | Town |
| Felton | 8 | 1,403 | 1,319 | 1.01% | 1,780 | 1 | Town |
| Frederica | 9 | 1,151 | 1,090 | 0.88% | 661 | 2 | Town |
| Houston | 10 | 411 | 389 | 0.98% | 1,073 | 0 | Town |
| Magnolia | 11 | 295 | 277 | 1.03% | 1,505 | 0 | Town |
| Bowers | 12 | 291 | 272 | 1.04% | 936 | 0 | Town |
| Slaughter Beach | 13 | 261 | 219 | 2.76% | 184 | 1 | Town |
| Kenton | 14 | 227 | 214 | 0.89% | 1,290 | 0 | Town |
| Little Creek | 15 | 207 | 194 | 0.98% | 2,091 | 0 | Town |
| Woodside | 16 | 203 | 188 | 1.5% | 1,208 | 0 | Town |
| Leipsic | 17 | 190 | 180 | 1.06% | 640 | 0 | Town |
| Viola | 18 | 147 | 140 | 0.68% | 831 | 0 | Town |
| Farmington | 19 | 105 | 90 | 2.94% | 1,438 | 0 | Town |
| Hartly | 20 | 82 | 70 | 2.5% | 1,439 | 0 | Town |
Dover is the largest city in Kent County, with a population of 40,583.
Hartly is the smallest city in Kent County, with a population of 82.
There are 20 cities in Kent County, Delaware.