| Area | Census 2000 | 7/1/2008 | Absolute Change | Relative Change |
| Delaware | 783,600 | 873,092 | 89,492 | 11.42% |
|---|---|---|---|---|
| Arden village | 474 | 484 | 10 | 2.11% |
| Ardencroft village | 267 | 275 | 8 | 3.00% |
| Ardentown village | 300 | 308 | 8 | 2.67% |
| Bellefonte town | 1,249 | 1,290 | 41 | 3.28% |
| Bethany Beach town | 903 | 964 | 61 | 6.76% |
| Bethel town | 184 | 202 | 18 | 9.78% |
| Blades town | 956 | 1,158 | 202 | 21.13% |
| Bowers town | 305 | 346 | 41 | 13.44% |
| Bridgeville town | 1,436 | 1,630 | 194 | 13.51% |
| Camden town | 2,100 | 2,565 | 465 | 22.14% |
| Cheswold town | 313 | 473 | 160 | 51.12% |
| Clayton town | 1,273 | 1,481 | 208 | 16.34% |
| Dagsboro town | 519 | 578 | 59 | 11.37% |
| Delaware City city | 1,453 | 1,517 | 64 | 4.40% |
| Delmar town | 1,407 | 1,516 | 109 | 7.75% |
| Dewey Beach town | 301 | 318 | 17 | 5.65% |
| Dover city | 32,135 | 36,107 | 3,972 | 12.36% |
| Ellendale town | 327 | 354 | 27 | 8.26% |
| Elsmere town | 5,800 | 5,688 | -112 | -1.93% |
| Farmington town | 75 | 85 | 10 | 13.33% |
| Felton town | 784 | 905 | 121 | 15.43% |
| Fenwick Island town | 342 | 366 | 24 | 7.02% |
| Frankford town | 714 | 777 | 63 | 8.82% |
| Frederica town | 648 | 751 | 103 | 15.90% |
| Georgetown town | 4,643 | 5,233 | 590 | 12.71% |
| Greenwood town | 837 | 907 | 70 | 8.36% |
| Harrington city | 3,174 | 3,435 | 261 | 8.22% |
| Hartly town | 78 | 88 | 10 | 12.82% |
| Henlopen Acres town | 139 | 142 | 3 | 2.16% |
| Houston town | 430 | 483 | 53 | 12.33% |
| Kenton town | 237 | 268 | 31 | 13.08% |
| Laurel town | 3,668 | 3,982 | 314 | 8.56% |
| Leipsic town | 203 | 229 | 26 | 12.81% |
| Lewes city | 2,932 | 3,127 | 195 | 6.65% |
| Little Creek town | 195 | 217 | 22 | 11.28% |
| Magnolia town | 226 | 250 | 24 | 10.62% |
| Middletown town | 6,161 | 12,152 | 5,991 | 97.24% |
| Milford city | 6,732 | 8,511 | 1,779 | 26.43% |
| Millsboro town | 2,360 | 2,698 | 338 | 14.32% |
| Millville town | 259 | 282 | 23 | 8.88% |
| Milton town | 1,657 | 1,835 | 178 | 10.74% |
| New Castle city | 4,862 | 4,977 | 115 | 2.37% |
| Newark city | 28,547 | 29,886 | 1,339 | 4.69% |
| Newport town | 1,122 | 1,106 | -16 | -1.43% |
| Ocean View town | 1,006 | 1,138 | 132 | 13.12% |
| Odessa town | 286 | 337 | 51 | 17.83% |
| Rehoboth Beach city | 1,495 | 1,587 | 92 | 6.15% |
| Seaford city | 6,699 | 7,260 | 561 | 8.37% |
| Selbyville town | 1,645 | 1,853 | 208 | 12.64% |
| Slaughter Beach town | 198 | 220 | 22 | 11.11% |
| Smyrna town | 5,679 | 8,603 | 2,924 | 51.49% |
| South Bethany town | 492 | 526 | 34 | 6.91% |
| Townsend town | 346 | 380 | 34 | 9.83% |
| Viola town | 156 | 174 | 18 | 11.54% |
| Wilmington city | 72,664 | 72,592 | -72 | -0.10% |
| Woodside town | 184 | 204 | 20 | 10.87% |
| Wyoming town | 1,141 | 1,410 | 269 | 23.58% |
Source: Population Division, U.S. Census Bureau