27 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 |
| Rising Sun-Lebanon | 5 | 4,227 | 4,170 | 1.32% | 1,183 | 4 | CDP |
| Highland Acres | 6 | 4,000 | 3,913 | 0.91% | 2,681 | 1 | CDP |
| Harrington | 7 | 3,973 | 3,778 | 0.99% | 1,459 | 3 | City |
| Dover Base Housing | 8 | 3,215 | 3,620 | -0.5% | 4,281 | 1 | CDP |
| Cheswold | 9 | 2,687 | 1,934 | 5.91% | 1,462 | 2 | Town |
| Riverview | 10 | 2,224 | 2,557 | -0.67% | 616 | 4 | CDP |
| Kent Acres | 11 | 2,182 | 1,832 | 0.88% | 2,570 | 1 | CDP |
| Woodside East | 12 | 1,923 | 2,167 | -1.38% | 1,123 | 2 | CDP |
| Wyoming | 13 | 1,912 | 1,707 | 2.19% | 1,826 | 1 | Town |
| Felton | 14 | 1,389 | 1,319 | 1.02% | 1,763 | 1 | Town |
| Rodney Village | 15 | 1,258 | 1,165 | -1.26% | 2,136 | 1 | CDP |
| Frederica | 16 | 1,141 | 1,090 | 0.88% | 655 | 2 | Town |
| Houston | 17 | 407 | 389 | 0.74% | 1,063 | 0 | Town |
| Magnolia | 18 | 292 | 277 | 1.04% | 1,490 | 0 | Town |
| Bowers | 19 | 288 | 272 | 1.05% | 926 | 0 | Town |
| Slaughter Beach | 20 | 254 | 219 | 2.83% | 179 | 1 | Town |
| Kenton | 21 | 225 | 214 | 0.9% | 1,278 | 0 | Town |
| Little Creek | 22 | 205 | 194 | 0.99% | 2,071 | 0 | Town |
| Woodside | 23 | 200 | 188 | 1.01% | 1,190 | 0 | Town |
| Leipsic | 24 | 188 | 180 | 0.53% | 633 | 0 | Town |
| Viola | 25 | 146 | 140 | 0.69% | 825 | 0 | Town |
| Farmington | 26 | 102 | 90 | 2% | 1,397 | 0 | Town |
| Hartly | 27 | 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 27 cities in Kent County, Delaware.