| 1 | Leyner CDP (south) | 9,147 |
| 2 | Lyons town (east 5) | 7,801 |
| 3 | Longmont city (east-southeast) | 7,757 |
| 4 | Paragon Estates CDP (east) | 7,319 |
| 5 | Eldorado Springs CDP (north-northwest) | 7,151 |
| 6 | Boulder city (southwest) | 6,993 |
| 7 | Niwot CDP (east) | 6,785 |
| 8 | Leyner CDP (north) | 6,784 |
| 9 | Longmont city (west-northwest) | 6,504 |
| 10 | Lazy Acres CDP (northeast 1) | 6,349 |
| 11 | Paragon Estates CDP (west) | 6,191 |
| 12 | Longmont city (south-southwest) | 6,133 |
| 13 | Lafayette city (west-northwest) | 6,020 |
| 14 | Niwot CDP (northwest) | 5,981 |
| 15 | Lazy Acres CDP (northeast 2) | 5,907 |
| 16 | Louisville city (west) | 5,853 |
| 17 | Louisville city (east) | 5,579 |
| 18 | Lyons town (east 1) | 5,487 |
| 19 | Valmont CDP (northwest) | 5,303 |
| 20 | Longmont city (northeast) | 5,227 |
| 21 | Superior town (north-northeast) | 5,188 |
| 22 | Longmont city (west-southwest) | 5,074 |
| 23 | Lyons town (southwest) | 5,050 |
| 24 | Boulder city (south) | 4,986 |
| 25 | Boulder city (north-northeast) | 4,981 |
| 26 | Niwot CDP (north-northeast) | 4,930 |
| 27 | Lazy Acres CDP (northwest 2) | 4,923 |
| 28 | Niwot CDP (south-southwest) | 4,907 |
| 29 | Lazy Acres CDP (south-southwest) | 4,862 |
| 30 | Lyons town (east 3) | 4,855 |
| 31 | Lafayette city (east) | 4,840 |
| 32 | Niwot CDP (southwest) | 4,702 |
| 33 | Boulder city (north-northwest) | 4,532 |
| 34 | Lyons town (east 4) | 4,439 |
| 35 | Lyons town (east 2) | 4,397 |
| 36 | Eldorado Springs CDP (west-northwest) | 4,029 |
| 37 | Superior town (south) | 4,024 |
| 38 | Eldorado Springs CDP (north-northeast) | 3,972 |
| 39 | Longmont city (northwest) | 3,883 |
| 40 | Lyons town (west-northwest 1) | 3,875 |
| 41 | Lafayette city (south) | 3,838 |
| 42 | Lyons town (west-northwest 2) | 3,777 |
| 43 | Longmont city (east-northeast) | 3,766 |
| 44 | Lazy Acres CDP (south 2) | 3,744 |
| 45 | Eldorado Springs CDP (southwest) | 3,719 |
| 46 | Longmont city (southeast) | 3,709 |
| 47 | Paragon Estates CDP (east-southeast) | 3,569 |
| 48 | St. Ann Highlands CDP (west-southwest) | 3,498 |
| 49 | St. Ann Highlands CDP (east-northeast) | 3,480 |
| 50 | Lafayette city (north-northeast) | 3,459 |
| 51 | Paragon Estates CDP (northwest) | 3,405 |
| 52 | Lazy Acres CDP (east-southeast) | 3,388 |
| 53 | Longmont city (north-northwest) | 3,380 |
| 54 | Eldorado Springs CDP (northeast) | 3,359 |
| 55 | Paragon Estates CDP (southeast) | 3,352 |
| 56 | Boulder city (west) | 3,343 |
| 57 | Superior town (northwest) | 3,291 |
| 58 | Boulder city (west-northwest) | 3,151 |
| 59 | Louisville city (north-northwest) | 3,076 |
| 60 | Louisville city (south-southwest) | 2,852 |
| 61 | Lafayette city (northwest) | 2,775 |
| 62 | Eldorado Springs CDP (east) | 2,586 |
| 63 | Lazy Acres CDP (south 1) | 2,545 |
| 64 | Paragon Estates CDP (west-southwest) | 2,535 |
| 65 | Valmont CDP (southeast) | 2,465 |
| 66 | Valmont CDP (west) | 2,342 |
| 67 | Lazy Acres CDP (northwest 1) | 2,267 |
| 68 | Paragon Estates CDP (west-northwest) | 2,243 |
| 69 | Boulder city (east-northeast) | 2,186 |
| 70 | Eldora CDP | 2,162 |
| 71 | Lyons town (northeast) | 2,045 |
| 72 | Gunbarrel CDP | 2,024 |
| 73 | Boulder city (southeast) | 1,869 |
| 74 | Lyons town (west-southwest) | 1,601 |
| 75 | Allenspark CDP | 1,412 |
| 76 | Boulder city (south-southeast) | 1,395 |
| 77 | Ward town | 1,246 |
| 78 | Eldorado Springs CDP (southeast) | 743 |