| City | Rank | Annual Change ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Cheswold | 1 | 5.69% | 2,804 | 1,938 |
| Milford | 2 | 4.71% | 15,417 | 11,296 |
| Millville | 3 | 2.89% | 2,207 | 1,847 |
| Clayton | 4 | 2.87% | 4,657 | 3,991 |
| Bridgeville | 5 | 2.87% | 3,083 | 2,590 |
| Selbyville | 6 | 2.87% | 3,478 | 2,920 |
| Ocean View | 7 | 2.86% | 3,196 | 2,682 |
| Millsboro | 8 | 2.86% | 8,116 | 6,817 |
| Milton | 9 | 2.85% | 3,970 | 3,339 |
| Camden | 10 | 2.8% | 4,293 | 3,721 |
| Laurel | 11 | 2.79% | 4,684 | 3,957 |
| Rehoboth Beach | 12 | 2.75% | 1,345 | 1,135 |
| Georgetown | 13 | 2.73% | 8,517 | 7,220 |
| Seaford | 14 | 2.72% | 9,414 | 7,982 |
| Blades | 15 | 2.7% | 1,409 | 1,192 |
| Delmar | 16 | 2.58% | 2,427 | 2,071 |
| Lewes | 17 | 2.56% | 3,924 | 3,355 |
| Wyoming | 18 | 2.2% | 1,906 | 1,706 |
| Middletown | 19 | 2.1% | 26,341 | 23,379 |
| Townsend | 20 | 1.54% | 3,031 | 2,751 |
| Frederica | 21 | 1.13% | 1,168 | 1,092 |
| Felton | 22 | 1.01% | 1,400 | 1,315 |
| Harrington | 23 | 0.98% | 4,013 | 3,787 |
| Wilmington | 24 | 0.78% | 74,084 | 70,889 |
| New Castle | 25 | 0.7% | 5,766 | 5,538 |
| Smyrna | 26 | 0.7% | 13,433 | 12,961 |
| Delaware City | 27 | 0.62% | 1,951 | 1,882 |
| Dover | 28 | 0.55% | 40,815 | 39,417 |
| Bellefonte | 29 | 0.46% | 1,319 | 1,285 |
| Elsmere | 30 | 0% | 6,196 | 6,219 |
| Newark | 31 | -0.16% | 30,311 | 30,611 |
Delaware's cities with over 1,000 residents show varied growth patterns from 2020 to 2025. Cheswold leads with 5.69% annualized growth, followed by Milford (4.71%) and Millville (2.89%). The largest population centers are Wilmington (74,084), Dover (40,815), and Newark (30,311). Of the 31 cities over 1,000 population, 30 are growing while 1 experienced population decline. Overall, cities averaged 2.09% annualized growth, with total urban population growing by 8.78% annually.