31 cities
| City | Rank | Annual Change ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Cheswold | 1 | 5.91% | 2,687 | 1,934 |
| Milford | 2 | 4.92% | 14,771 | 11,310 |
| Ocean View | 3 | 2.98% | 3,113 | 2,663 |
| Millville | 4 | 2.94% | 2,170 | 1,857 |
| Millsboro | 5 | 2.92% | 8,094 | 6,943 |
| Milton | 6 | 2.89% | 3,882 | 3,335 |
| Clayton | 7 | 2.88% | 4,641 | 3,989 |
| Selbyville | 8 | 2.86% | 3,379 | 2,907 |
| Bridgeville | 9 | 2.85% | 2,992 | 2,574 |
| Laurel | 10 | 2.82% | 4,519 | 3,896 |
| Georgetown | 11 | 2.79% | 8,324 | 7,193 |
| Rehoboth Beach | 12 | 2.78% | 1,292 | 1,115 |
| Blades | 13 | 2.78% | 1,367 | 1,179 |
| Camden | 14 | 2.77% | 4,307 | 3,726 |
| Seaford | 15 | 2.7% | 9,194 | 7,982 |
| Delmar | 16 | 2.59% | 2,337 | 2,040 |
| Lewes | 17 | 2.57% | 3,797 | 3,320 |
| Middletown | 18 | 2.23% | 26,259 | 23,392 |
| Wyoming | 19 | 2.19% | 1,912 | 1,707 |
| Townsend | 20 | 1.67% | 2,990 | 2,743 |
| Felton | 21 | 1.02% | 1,389 | 1,319 |
| Harrington | 22 | 0.99% | 3,973 | 3,778 |
| Frederica | 23 | 0.88% | 1,141 | 1,090 |
| Wilmington | 24 | 0.8% | 73,759 | 70,842 |
| New Castle | 25 | 0.75% | 5,758 | 5,543 |
| Smyrna | 26 | 0.67% | 13,415 | 12,967 |
| Delaware City | 27 | 0.62% | 1,945 | 1,883 |
| Dover | 28 | 0.49% | 40,387 | 39,407 |
| Bellefonte | 29 | 0.48% | 1,255 | 1,225 |
| Elsmere | 30 | 0.03% | 6,236 | 6,223 |
| Newark | 31 | -0.08% | 30,483 | 30,598 |
Delaware's cities with over 1,000 residents show varied growth patterns from 2020 to 2025. Cheswold leads with 5.91% annualized growth, followed by Milford (4.92%) and Ocean View (2.98%). The largest population centers are Wilmington (73,759), Dover (40,387), and Newark (30,483). Of the 31 cities over 1,000 population, 30 are growing while 1 experienced population decline. Overall, cities averaged 2.12% annualized growth, with total urban population growing by 7.79% annually.