| 1 | St. Georges CDP (south) | 9,519 |
| 2 | Glasgow CDP (east) | 8,352 |
| 3 | Bear CDP (west-northwest) | 7,556 |
| 4 | Newark city (east-southeast) | 7,426 |
| 5 | Port Penn CDP | 7,361 |
| 6 | Bear CDP (south) | 7,357 |
| 7 | Glasgow CDP (south-southeast) | 7,039 |
| 8 | Middletown town (west) | 7,033 |
| 9 | Hockessin CDP (east-northeast) | 6,957 |
| 10 | Middletown town (east-southeast) | 6,955 |
| 11 | Middletown town (northeast) | 6,868 |
| 12 | St. Georges CDP (north) | 6,806 |
| 13 | Middletown town (north) | 6,803 |
| 14 | Unincorporated (south-southwest 5) | 6,739 |
| 15 | Unincorporated (south 1) | 6,619 |
| 16 | Glasgow CDP (north) | 6,605 |
| 17 | Hockessin CDP (west) | 6,400 |
| 18 | Wilmington Manor CDP (north-northwest) | 6,079 |
| 19 | Unincorporated (southwest 2) | 6,027 |
| 20 | Pike Creek CDP (east-southeast) | 5,948 |
| 21 | Brookside CDP (south-southeast) | 5,916 |
| 22 | Pike Creek Valley CDP (west-southwest) | 5,880 |
| 23 | Edgemoor CDP (northeast) | 5,803 |
| 24 | Middletown town (south-southwest) | 5,791 |
| 25 | Unincorporated (south-southwest 1) | 5,748 |
| 26 | Pike Creek Valley CDP (north-northwest) | 5,650 |
| 27 | Newark city (south 2) | 5,634 |
| 28 | Pike Creek CDP (west-northwest) | 5,588 |
| 29 | Middletown town (north-northwest) | 5,543 |
| 30 | New Castle city (west) | 5,510 |
| 31 | Unincorporated (south-southwest 3) | 5,407 |
| 32 | Unincorporated (south-southwest 2) | 5,401 |
| 33 | Unincorporated (south-southwest 4) | 5,314 |
| 34 | Newark city (north) | 5,227 |
| 35 | Brookside CDP (west-southwest) | 5,172 |
| 36 | Newark city (northwest) | 5,071 |
| 37 | Wilmington city (north-northeast 1) | 4,992 |
| 38 | Elsmere town (southeast) | 4,979 |
| 39 | Unincorporated (south-southwest 7) | 4,955 |
| 40 | Claymont CDP (southwest) | 4,902 |
| 41 | Brookside CDP (north-northeast) | 4,891 |
| 42 | Unincorporated (north-northeast 1) | 4,885 |
| 43 | Unincorporated (north-northeast 8) | 4,822 |
| 44 | Glasgow CDP (west-southwest) | 4,820 |
| 45 | Unincorporated (west-southwest 2) | 4,612 |
| 46 | Unincorporated (north 1) | 4,576 |
| 47 | Unincorporated (south 4) | 4,570 |
| 48 | Newport town (east-northeast) | 4,560 |
| 49 | Wilmington city (west 3) | 4,512 |
| 50 | Elsmere town (west-southwest) | 4,493 |
| 51 | North Star CDP (southwest) | 4,440 |
| 52 | Greenville CDP (north) | 4,350 |
| 53 | Newport town (west-southwest) | 4,320 |
| 54 | New Castle city (south-southwest) | 4,311 |
| 55 | Wilmington city (west-southwest 1) | 4,310 |
| 56 | Unincorporated (north 2) | 4,234 |
| 57 | Unincorporated (north-northeast 6) | 4,185 |
| 58 | Newark city (west-southwest) | 4,169 |
| 59 | Pike Creek Valley CDP (east-southeast) | 4,156 |
| 60 | Unincorporated (southwest 3) | 4,136 |
| 61 | Unincorporated (west-southwest 3) | 4,125 |
| 62 | Unincorporated (south-southwest 6) | 4,105 |
| 63 | Claymont CDP (east) | 4,087 |
| 64 | Unincorporated (south 5) | 4,073 |
| 65 | Glasgow CDP (west-northwest) | 4,053 |
| 66 | Newark city (south-southwest) | 4,034 |
| 67 | Unincorporated (north-northeast 4) | 4,029 |
| 68 | Edgemoor CDP (south-southwest) | 3,962 |
| 69 | Unincorporated (northwest 1) | 3,958 |
| 70 | Unincorporated (west-southwest 1) | 3,901 |
| 71 | Wilmington city (northwest 1) | 3,763 |
| 72 | North Star CDP (northeast) | 3,738 |
| 73 | Wilmington city (west-southwest 2) | 3,678 |
| 74 | Newark city (west) | 3,655 |
| 75 | Smyrna town (northeast) | 3,632 |
| 76 | Claymont CDP (west) | 3,585 |
| 77 | Unincorporated (north-northeast 10) | 3,549 |
| 78 | Wilmington city (north-northeast 3) | 3,498 |
| 79 | Unincorporated (north-northeast 12) | 3,463 |
| 80 | New Castle city (north-northeast) | 3,414 |
| 81 | Unincorporated (northeast 1) | 3,353 |
| 82 | Ardentown village | 3,321 |
| 83 | Wilmington city (east-southeast) | 3,305 |
| 84 | Wilmington Manor CDP (south-southeast) | 3,280 |
| 85 | Wilmington city (west 1) | 3,247 |
| 86 | Wilmington city (north-northwest) | 3,221 |
| 87 | Unincorporated (southwest 1) | 3,195 |
| 88 | Unincorporated (west 2) | 3,182 |
| 89 | Unincorporated (southwest 4) | 3,171 |
| 90 | Greenville CDP (south) | 3,150 |
| 91 | Wilmington city (north-northeast 2) | 3,150 |
| 92 | Delaware City city | 3,133 |
| 93 | Elsmere town (north) | 3,133 |
| 94 | Unincorporated (north-northeast 11) | 3,073 |
| 95 | Wilmington city (east-northeast) | 3,059 |
| 96 | Unincorporated (north-northwest) | 3,010 |
| 97 | Wilmington city (southwest) | 2,997 |
| 98 | Wilmington city (north 1) | 2,962 |
| 99 | Unincorporated (north 3) | 2,902 |
| 100 | Newark city (south 1) | 2,889 |
| 101 | Unincorporated (east-northeast) | 2,877 |
| 102 | Unincorporated (east-southeast) | 2,852 |
| 103 | Wilmington city (northeast 3) | 2,815 |
| 104 | New Castle city (south) | 2,783 |
| 105 | Unincorporated (northwest 2) | 2,751 |
| 106 | Unincorporated (north-northeast 3) | 2,684 |
| 107 | Arden village | 2,671 |
| 108 | Unincorporated (north-northeast 2) | 2,664 |
| 109 | Unincorporated (north-northeast 7) | 2,580 |
| 110 | Claymont CDP (north-northeast) | 2,555 |
| 111 | Unincorporated (south 2) | 2,506 |
| 112 | Unincorporated (east 2) | 2,490 |
| 113 | Wilmington city (northwest 3) | 2,483 |
| 114 | Smyrna town (southwest) | 2,440 |
| 115 | Wilmington city (west 2) | 2,421 |
| 116 | Wilmington city (northeast 2) | 2,398 |
| 117 | Wilmington city (northeast 1) | 2,377 |
| 118 | Wilmington city (north 2) | 2,373 |
| 119 | Unincorporated (northwest 3) | 2,329 |
| 120 | Unincorporated (east 1) | 2,327 |
| 121 | Unincorporated (west-northwest 2) | 2,292 |
| 122 | Bear CDP (east) | 2,257 |
| 123 | Wilmington city (west-northwest) | 2,251 |
| 124 | New Castle city (northeast) | 2,245 |
| 125 | Wilmington city (southeast) | 2,187 |
| 126 | Newark city (north-northeast) | 2,171 |
| 127 | Unincorporated (northeast 2) | 2,149 |
| 128 | Unincorporated (north-northeast 5) | 2,127 |
| 129 | Wilmington city (northwest 2) | 2,109 |
| 130 | Unincorporated (west 1) | 2,028 |
| 131 | New Castle city (east) | 1,965 |
| 132 | Newark city (southeast) | 1,937 |
| 133 | Unincorporated (west-northwest 1) | 1,918 |
| 134 | Unincorporated (west-northwest 3) | 1,902 |
| 135 | Edgemoor CDP (west-southwest) | 1,834 |
| 136 | Unincorporated (south 3) | 1,805 |
| 137 | Wilmington city (northwest 4) | 1,779 |
| 138 | Unincorporated (north-northeast 9) | 1,681 |
| 139 | Hockessin CDP (southeast) | 1,635 |
| 140 | Newark city (north-northwest) | 1,621 |
| 141 | Unincorporated (south-southeast) | 1,611 |
| 142 | Newark city (east-northeast) | 1,594 |
| 143 | Wilmington city (west 4) | 1,237 |