27 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Dover | 1 | 40,276 | 39,320 | 0.48% | 1,691 | 23.82 | City |
| Smyrna | 2 | 13,491 | 12,956 | 0.8% | 2,105 | 6.41 | Town |
| Clayton | 3 | 4,671 | 3,990 | 3% | 2,398 | 1.95 | Town |
| Camden | 4 | 4,495 | 3,727 | 3.55% | 1,200 | 3.75 | Town |
| Rising Sun-Lebanon | 5 | 4,227 | 4,170 | 1.32% | 1,183 | 3.57 | CDP |
| Highland Acres | 6 | 4,000 | 3,913 | 0.91% | 2,681 | 1.49 | CDP |
| Harrington | 7 | 3,914 | 3,778 | 0.69% | 1,437 | 2.72 | City |
| Dover Base Housing | 8 | 3,215 | 3,620 | -0.5% | 4,281 | 0.75 | CDP |
| Cheswold | 9 | 2,472 | 1,934 | 4.57% | 1,345 | 1.84 | Town |
| Riverview | 10 | 2,224 | 2,557 | -0.67% | 616 | 3.61 | CDP |
| Kent Acres | 11 | 2,182 | 1,832 | 0.88% | 2,570 | 0.85 | CDP |
| Wyoming | 12 | 1,975 | 1,707 | 2.81% | 1,886 | 1.05 | Town |
| Woodside East | 13 | 1,923 | 2,167 | -1.38% | 1,123 | 1.71 | CDP |
| Felton | 14 | 1,380 | 1,319 | 0.88% | 1,751 | 0.79 | Town |
| Rodney Village | 15 | 1,258 | 1,165 | -1.26% | 2,136 | 0.59 | CDP |
| Frederica | 16 | 1,136 | 1,085 | 0.89% | 652 | 1.74 | Town |
| Houston | 17 | 404 | 389 | 0.75% | 1,055 | 0.38 | Town |
| Bowers | 18 | 291 | 275 | 1.04% | 936 | 0.31 | Town |
| Magnolia | 19 | 289 | 279 | 0.7% | 1,474 | 0.20 | Town |
| Slaughter Beach | 20 | 255 | 219 | 2.82% | 180 | 1.42 | Town |
| Kenton | 21 | 231 | 218 | 1.32% | 1,313 | 0.18 | Town |
| Little Creek | 22 | 204 | 194 | 0.99% | 2,061 | 0.10 | Town |
| Woodside | 23 | 198 | 190 | 1.02% | 1,179 | 0.17 | Town |
| Leipsic | 24 | 188 | 180 | 1.08% | 633 | 0.30 | Town |
| Viola | 25 | 150 | 142 | 1.35% | 847 | 0.18 | Town |
| Farmington | 26 | 104 | 91 | 2.97% | 1,425 | 0.07 | Town |
| Hartly | 27 | 81 | 71 | 2.53% | 1,421 | 0.06 | Town |
Dover is the largest city in Kent County, with a population of 40,276.
Hartly is the smallest city in Kent County.
There are 27 cities in Kent County, Delaware.