| Zip Code | City | Population ↓ |
|---|---|---|
| 80134 | Parker | 75,383 |
| 80126 | Littleton | 43,691 |
| 80138 | Parker | 36,113 |
| 80104 | Castle Rock | 35,084 |
| 80108 | Castle Rock | 33,259 |
| 80129 | Littleton | 29,974 |
| 80109 | Castle Rock | 27,852 |
| 80130 | Littleton | 25,551 |
| 80124 | Lone Tree | 22,567 |
| 80125 | Littleton | 13,048 |
| 80118 | Larkspur | 5,940 |
| 80116 | Franktown | 4,884 |
| 80135 | Sedalia | 4,061 |
| 80131 | Louviers | 250 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 14 ZCTAs in Douglas County, Colorado (US Census).