35 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 80634 | Greeley | 65,622 |
| 80504 | Longmont | 63,451 |
| 80631 | Greeley | 53,722 |
| 80550 | Windsor | 46,456 |
| 80516 | Erie | 39,048 |
| 80620 | Evans | 20,798 |
| 80534 | Johnstown | 20,502 |
| 80621 | Fort Lupton | 15,060 |
| 80543 | Milliken | 9,774 |
| 80615 | Eaton | 9,060 |
| 80514 | Dacono | 6,721 |
| 80530 | Frederick | 6,242 |
| 80542 | Mead | 5,155 |
| 80643 | Keenesburg | 5,119 |
| 80645 | La Salle | 4,917 |
| 80651 | Platteville | 4,837 |
| 80642 | Hudson | 4,466 |
| 80610 | Ault | 4,132 |
| 80650 | Pierce | 2,192 |
| 80644 | Kersey | 2,124 |
| 80520 | Firestone | 1,140 |
| 80623 | Gilcrest | 1,026 |
| 80648 | Nunn | 902 |
| 80624 | Gill | 685 |
| 80611 | Briggsdale | 557 |
| 80612 | Carr | 494 |
| 80729 | Grover | 350 |
| 80652 | Roggen | 299 |
| 80622 | Galeton | 282 |
| 80546 | Severance | 271 |
| 80649 | Orchard | 263 |
| 80742 | New Raymer | 204 |
| 80754 | Stoneham | 141 |
| 80732 | Hereford | 42 |
| 80646 | Lucerne | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 35 ZCTAs in Weld County, Colorado (US Census).