14 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 80134 | Parker | 80,302 |
| 80126 | Littleton | 44,882 |
| 80104 | Castle Rock | 38,479 |
| 80138 | Parker | 36,895 |
| 80108 | Castle Rock | 36,730 |
| 80129 | Littleton | 30,223 |
| 80109 | Castle Rock | 28,400 |
| 80130 | Littleton | 24,719 |
| 80124 | Lone Tree | 22,555 |
| 80125 | Littleton | 15,630 |
| 80118 | Larkspur | 5,632 |
| 80116 | Franktown | 5,132 |
| 80135 | Sedalia | 4,141 |
| 80131 | Louviers | 276 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 14 ZCTAs in Douglas County, Colorado (US Census).