| 1 | Unincorporated (west-northwest 2) | 7,779 |
| 2 | Bowmansville CDP | 7,609 |
| 3 | Refton CDP | 7,590 |
| 4 | Unincorporated (east-northeast 2) | 7,397 |
| 5 | Hinkletown CDP | 7,138 |
| 6 | Unincorporated (southeast 2) | 7,039 |
| 7 | Ephrata borough (east-southeast) | 6,993 |
| 8 | Swartzville CDP | 6,875 |
| 9 | Unincorporated (north-northeast 4) | 6,817 |
| 10 | Witmer CDP | 6,793 |
| 11 | Millersville borough (south-southwest) | 6,786 |
| 12 | Lancaster city (north-northeast) | 6,564 |
| 13 | East Petersburg borough | 6,535 |
| 14 | Soudersburg CDP | 6,399 |
| 15 | Unincorporated (west-southwest) | 6,376 |
| 16 | Reamstown CDP | 6,332 |
| 17 | Unincorporated (south-southeast 1) | 6,276 |
| 18 | Unincorporated (north-northeast 2) | 6,221 |
| 19 | Elizabethtown borough (south-southeast) | 6,197 |
| 20 | Unincorporated (south-southwest 1) | 6,104 |
| 21 | Unincorporated (northeast 1) | 6,098 |
| 22 | Salunga CDP (southwest) | 6,071 |
| 23 | Rheems CDP (northeast) | 6,023 |
| 24 | Gap CDP | 5,822 |
| 25 | Penryn CDP (south-southeast) | 5,817 |
| 26 | Wakefield CDP | 5,797 |
| 27 | Willow Street CDP (southwest) | 5,750 |
| 28 | New Holland borough | 5,743 |
| 29 | Clay CDP | 5,681 |
| 30 | Paradise CDP | 5,667 |
| 31 | Cambridge CDP | 5,665 |
| 32 | Elizabethtown borough (north-northwest) | 5,660 |
| 33 | Intercourse CDP | 5,657 |
| 34 | Millersville borough (northwest) | 5,630 |
| 35 | Unincorporated (southwest 2) | 5,570 |
| 36 | Unincorporated (northeast 3) | 5,557 |
| 37 | Landisville CDP | 5,420 |
| 38 | Lancaster city (east 2) | 5,417 |
| 39 | Willow Street CDP (east) | 5,378 |
| 40 | Leola CDP (west-southwest) | 5,372 |
| 41 | Lancaster city (south-southwest) | 5,339 |
| 42 | Lititz borough (east) | 5,330 |
| 43 | Maytown CDP | 5,297 |
| 44 | Unincorporated (southwest 3) | 5,258 |
| 45 | Rohrerstown CDP | 5,200 |
| 46 | Unincorporated (south-southeast 2) | 5,195 |
| 47 | Brickerville CDP | 5,186 |
| 48 | Quarryville borough | 5,171 |
| 49 | Millersville borough (north-northeast) | 5,134 |
| 50 | Lancaster city (south) | 5,053 |
| 51 | Lampeter CDP | 5,044 |
| 52 | Manheim borough | 5,028 |
| 53 | Lancaster city (north) | 5,016 |
| 54 | Unincorporated (north-northeast 3) | 4,997 |
| 55 | Unincorporated (west 1) | 4,982 |
| 56 | Mount Joy borough (southwest) | 4,771 |
| 57 | Unincorporated (west-northwest 1) | 4,730 |
| 58 | Brownstown CDP | 4,632 |
| 59 | Unincorporated (northeast 2) | 4,610 |
| 60 | Churchtown CDP | 4,588 |
| 61 | Lancaster city (west 2) | 4,582 |
| 62 | Columbia borough (north) | 4,487 |
| 63 | Christiana borough | 4,473 |
| 64 | Blue Ball CDP | 4,472 |
| 65 | Penryn CDP (north-northwest) | 4,464 |
| 66 | Lancaster city (southeast 1) | 4,432 |
| 67 | Unincorporated (north-northeast 1) | 4,354 |
| 68 | Rothsville CDP | 4,285 |
| 69 | Unincorporated (northwest) | 4,280 |
| 70 | Lititz borough (west) | 4,269 |
| 71 | Unincorporated (north) | 4,229 |
| 72 | Lancaster city (east-southeast) | 4,169 |
| 73 | Lancaster city (southeast 2) | 4,163 |
| 74 | Akron borough | 4,133 |
| 75 | Little Britain CDP | 4,133 |
| 76 | Unincorporated (southwest 1) | 4,072 |
| 77 | Lancaster city (northwest 3) | 4,048 |
| 78 | Rheems CDP (southwest) | 4,027 |
| 79 | Unincorporated (southeast 1) | 3,922 |
| 80 | Kirkwood CDP | 3,910 |
| 81 | Reinholds CDP | 3,898 |
| 82 | Conestoga CDP | 3,897 |
| 83 | Columbia borough (east-southeast) | 3,881 |
| 84 | Farmersville CDP | 3,875 |
| 85 | Lancaster city (east 3) | 3,784 |
| 86 | Denver borough | 3,775 |
| 87 | Unincorporated (south-southwest 2) | 3,696 |
| 88 | Millersville borough (east-northeast) | 3,695 |
| 89 | Schoeneck CDP | 3,658 |
| 90 | Washington Boro CDP | 3,633 |
| 91 | Unincorporated (east-northeast 1) | 3,621 |
| 92 | Mountville borough | 3,606 |
| 93 | Ephrata borough (north-northwest) | 3,599 |
| 94 | Leola CDP (east-northeast) | 3,548 |
| 95 | Mount Joy borough (northeast) | 3,539 |
| 96 | Willow Street CDP (north-northwest) | 3,521 |
| 97 | Lancaster city (northwest 1) | 3,416 |
| 98 | Lancaster city (south-southeast) | 3,397 |
| 99 | Lancaster city (southwest 1) | 3,395 |
| 100 | Unincorporated (west 2) | 3,358 |
| 101 | Bainbridge CDP | 3,338 |
| 102 | Goodville CDP | 3,304 |
| 103 | Georgetown CDP | 3,202 |
| 104 | Lancaster city (northwest 2) | 3,142 |
| 105 | Millersville borough (south) | 3,141 |
| 106 | Ephrata borough (west-southwest) | 3,137 |
| 107 | Lancaster city (west 1) | 3,127 |
| 108 | Salunga CDP (northeast) | 3,097 |
| 109 | Lancaster city (west-southwest) | 3,079 |
| 110 | Lancaster city (southwest 3) | 3,011 |
| 111 | Unincorporated (east) | 2,999 |
| 112 | Lancaster city (northeast) | 2,941 |
| 113 | Marietta borough | 2,827 |
| 114 | Lancaster city (east 1) | 2,720 |
| 115 | Lancaster city (southwest 2) | 2,365 |
| 116 | Columbia borough (southwest) | 1,849 |