| 1 | Brambleton CDP (south) | 14,155 |
| 2 | South Riding CDP (west-southwest) | 12,284 |
| 3 | Goose Creek Village CDP (north-northwest) | 8,609 |
| 4 | Waterford CDP (north-northwest) | 8,568 |
| 5 | Stone Ridge CDP (east-southeast 1) | 8,456 |
| 6 | South Riding CDP (northeast) | 8,215 |
| 7 | Arcola CDP (south-southeast) | 8,184 |
| 8 | Waterford CDP (southeast) | 8,121 |
| 9 | Hamilton town (east-northeast) | 7,920 |
| 10 | Stone Ridge CDP (east-southeast 2) | 7,884 |
| 11 | Stone Ridge CDP (west-northwest) | 7,806 |
| 12 | South Riding CDP (east-northeast) | 7,501 |
| 13 | Purcellville town (east-northeast) | 7,442 |
| 14 | Aldie CDP (west-northwest) | 7,271 |
| 15 | Dulles Town Center CDP (south-southeast) | 7,233 |
| 16 | Ashburn CDP (south-southeast) | 7,191 |
| 17 | Aldie CDP (east) | 7,171 |
| 18 | Broadlands CDP (south-southeast) | 7,153 |
| 19 | Waterford CDP (south-southeast) | 7,089 |
| 20 | Loudoun Valley Estates CDP (south-southeast) | 6,997 |
| 21 | Loudoun Valley Estates CDP (northwest) | 6,937 |
| 22 | Sugarland Run CDP (south) | 6,834 |
| 23 | Goose Creek Village CDP (northwest) | 6,806 |
| 24 | Sugarland Run CDP (north) | 6,773 |
| 25 | Lowes Island CDP (east-southeast) | 6,599 |
| 26 | Broadlands CDP (north-northwest) | 6,412 |
| 27 | Loudoun Valley Estates CDP (west-southwest) | 6,371 |
| 28 | Sterling CDP (east) | 6,364 |
| 29 | Hillsboro town (south) | 6,227 |
| 30 | Leesburg town (north-northeast) | 6,148 |
| 31 | Goose Creek Village CDP (southwest) | 6,029 |
| 32 | Belmont CDP (west-northwest) | 5,976 |
| 33 | Countryside CDP (south-southeast) | 5,946 |
| 34 | Goose Creek Village CDP (east-southeast) | 5,876 |
| 35 | Round Hill town | 5,770 |
| 36 | Lansdowne CDP (northwest) | 5,744 |
| 37 | Lansdowne CDP (southeast) | 5,689 |
| 38 | South Riding CDP (west-northwest) | 5,631 |
| 39 | Lowes Island CDP (southwest) | 5,618 |
| 40 | Ashburn CDP (east-southeast) | 5,557 |
| 41 | Purcellville town (west-southwest) | 5,537 |
| 42 | Goose Creek Village CDP (east) | 5,369 |
| 43 | Hamilton town (west-southwest) | 5,345 |
| 44 | University Center CDP (southeast) | 5,301 |
| 45 | Countryside CDP (west) | 5,133 |
| 46 | Hillsboro town (north) | 5,024 |
| 47 | Belmont CDP (southeast) | 4,926 |
| 48 | Oak Grove CDP (north-northeast) | 4,922 |
| 49 | Countryside CDP (east) | 4,814 |
| 50 | Ashburn CDP (north-northwest) | 4,713 |
| 51 | Waterford CDP (southwest) | 4,675 |
| 52 | South Riding CDP (east-southeast) | 4,669 |
| 53 | Cascades CDP (northeast) | 4,641 |
| 54 | Lowes Island CDP (north-northeast) | 4,600 |
| 55 | One Loudoun CDP (south-southwest) | 4,484 |
| 56 | Belmont CDP (south-southeast) | 4,393 |
| 57 | Kincora CDP (east-southeast) | 4,279 |
| 58 | Sterling CDP (west) | 4,059 |
| 59 | Leesburg town (north) | 3,990 |
| 60 | Cascades CDP (southwest) | 3,906 |
| 61 | Sterling CDP (west-southwest) | 3,779 |
| 62 | Belmont CDP (north-northeast) | 3,773 |
| 63 | Dulles Town Center CDP (north-northwest) | 3,726 |
| 64 | Arcola CDP (north-northwest) | 3,701 |
| 65 | Kincora CDP (west-northwest) | 3,661 |
| 66 | Lovettsville town | 3,621 |
| 67 | One Loudoun CDP (north-northeast) | 3,248 |
| 68 | Leesburg town (south-southwest) | 2,994 |
| 69 | Aldie CDP (south-southeast) | 2,811 |
| 70 | Loudoun Valley Estates CDP (north-northeast) | 2,808 |
| 71 | Moorefield CDP | 2,707 |
| 72 | Brambleton CDP (north) | 2,498 |
| 73 | Oak Grove CDP (south-southwest) | 2,459 |
| 74 | University Center CDP (northwest) | 1,959 |