| Rank | City | 1990 Population |
|---|---|---|
| 1 | Wilmington | 71,526 |
| 2 | Dover | 28,775 |
| 3 | Newark | 26,870 |
| 4 | Milford | 6,296 |
| 5 | Elsmere | 5,845 |
| 6 | Seaford | 5,673 |
| 7 | Smyrna | 5,413 |
| 8 | New Castle | 4,893 |
| 9 | Georgetown | 3,964 |
| 10 | Middletown | 3,738 |
| 11 | Laurel | 3,412 |
| 12 | Harrington | 2,428 |
| 13 | Lewes | 2,331 |
| 14 | Camden | 1,911 |
| 15 | Milton | 1,693 |
| 16 | Millsboro | 1,679 |
| 17 | Delaware City | 1,677 |
| 18 | Wyoming | 1,533 |
| 19 | Selbyville | 1,474 |
| 20 | Bridgeville | 1,353 |
| 21 | Rehoboth Beach | 1,327 |
| 22 | Delmar | 1,285 |
| 23 | Bellefonte | 1,271 |
| 24 | Newport | 1,149 |
| 25 | Blades | 1,073 |
| 26 | Clayton | 1,069 |
| 27 | Frederica | 766 |
| 28 | Ocean View | 766 |
| 29 | Felton | 673 |
| 30 | Greenwood | 584 |
| 31 | Frankford | 533 |
| 32 | Dagsboro | 485 |
| 33 | Arden | 479 |
| 34 | Houston | 476 |
| 35 | Kenton | 435 |
| 36 | Townsend | 416 |
| 37 | Ellendale | 332 |
| 38 | Ardentown | 325 |
| 39 | Bethany Beach | 313 |
| 40 | Cheswold | 309 |
| 41 | Magnolia | 286 |
| 42 | Odessa | 282 |
| 43 | Ardencroft | 280 |
| 44 | Leipsic | 220 |
| 45 | Dewey Beach | 207 |
| 46 | Millville | 188 |
| 47 | Bowers | 184 |
| 48 | Fenwick Island | 177 |
| 49 | Viola | 175 |
| 50 | Bethel | 156 |
| 51 | South Bethany | 145 |
| 52 | Woodside | 144 |
| 53 | Little Creek | 138 |
| 54 | Farmington | 116 |
| 55 | Henlopen Acres | 107 |
| 56 | Slaughter Beach | 99 |
| 57 | Hartly | 77 |
In 1990, the largest city in Delaware was Wilmington, with a population of 71,526. The second largest city is Dover, with a population of 28,775.
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