| Zip Code | Primary City | Secondary City | More Information |
| 80023 | Broomfield | Thornton | Thornton population stats |
| 80221 | Denver | Thornton | Thornton population stats |
| 80229 | Denver | Thornton | Thornton population stats |
| 80233 | Denver | Thornton | Thornton population stats |
| 80260 | Denver | Thornton | Thornton population stats |
| 80602 | Brighton | Thornton | Thornton population stats |
| 80022 | Commerce City | Brighton | Brighton population stats |
| 80234 | Denver | Thornton | Thornton population stats |
| 80601 | Brighton | Thornton | Thornton population stats |
| 80241 | Thornton | Thornton | Thornton population stats |
| 80602 | Brighton | Brighton | Brighton population stats |
| 80603 | Brighton | Brighton | Brighton population stats |