14 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 80134 | Parker | 77,814 |
| 80126 | Littleton | 44,482 |
| 80104 | Castle Rock | 36,461 |
| 80138 | Parker | 35,942 |
| 80108 | Castle Rock | 35,485 |
| 80129 | Littleton | 29,495 |
| 80109 | Castle Rock | 27,795 |
| 80130 | Littleton | 25,293 |
| 80124 | Lone Tree | 22,472 |
| 80125 | Littleton | 13,876 |
| 80118 | Larkspur | 5,950 |
| 80116 | Franktown | 5,393 |
| 80135 | Sedalia | 4,333 |
| 80131 | Louviers | 258 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 14 ZCTAs in Douglas County, Colorado (US Census).