31 cities
| City | Rank | Annual Change ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Cheswold | 1 | 5.62% | 2,838 | 1,934 |
| Milford | 2 | 4.68% | 15,463 | 11,310 |
| Millville | 3 | 2.9% | 2,233 | 1,857 |
| Ocean View | 4 | 2.89% | 3,203 | 2,663 |
| Millsboro | 5 | 2.84% | 8,324 | 6,943 |
| Milton | 6 | 2.83% | 3,992 | 3,335 |
| Clayton | 7 | 2.82% | 4,772 | 3,989 |
| Selbyville | 8 | 2.81% | 3,474 | 2,907 |
| Bridgeville | 9 | 2.81% | 3,076 | 2,574 |
| Rehoboth Beach | 10 | 2.79% | 1,328 | 1,115 |
| Blades | 11 | 2.78% | 1,405 | 1,179 |
| Laurel | 12 | 2.77% | 4,644 | 3,896 |
| Georgetown | 13 | 2.72% | 8,550 | 7,193 |
| Camden | 14 | 2.69% | 4,423 | 3,726 |
| Seaford | 15 | 2.64% | 9,437 | 7,982 |
| Delmar | 16 | 2.57% | 2,397 | 2,040 |
| Lewes | 17 | 2.53% | 3,893 | 3,320 |
| Middletown | 18 | 2.19% | 26,833 | 23,392 |
| Wyoming | 19 | 2.14% | 1,953 | 1,707 |
| Townsend | 20 | 1.67% | 3,040 | 2,743 |
| Felton | 21 | 1.01% | 1,403 | 1,319 |
| Harrington | 22 | 0.98% | 4,012 | 3,778 |
| Frederica | 23 | 0.88% | 1,151 | 1,090 |
| Wilmington | 24 | 0.79% | 74,343 | 70,842 |
| New Castle | 25 | 0.75% | 5,801 | 5,543 |
| Smyrna | 26 | 0.67% | 13,505 | 12,967 |
| Delaware City | 27 | 0.67% | 1,958 | 1,883 |
| Dover | 28 | 0.49% | 40,583 | 39,407 |
| Bellefonte | 29 | 0.48% | 1,261 | 1,225 |
| Elsmere | 30 | 0.05% | 6,239 | 6,223 |
| Newark | 31 | -0.08% | 30,460 | 30,598 |
Delaware's cities with over 1,000 residents show varied growth patterns from 2020 to 2025. Cheswold leads with 5.62% annualized growth, followed by Milford (4.68%) and Millville (2.9%). The largest population centers are Wilmington (74,343), Dover (40,583), and Newark (30,460). Of the 31 cities over 1,000 population, 30 are growing while 1 experienced population decline. Overall, cities averaged 2.08% annualized growth, with total urban population growing by 9.35% annually.