| Zip Code | City | Population ↓ |
|---|---|---|
| 82604 | Casper | 27,487 |
| 82601 | Casper | 26,721 |
| 82609 | Casper | 18,714 |
| 82636 | Evansville | 4,259 |
| 82644 | Mills | 2,098 |
| 82643 | Midwest | 267 |
| 82620 | Alcova | 164 |
| 82638 | Hiland | 116 |
| 82635 | Edgerton | 87 |
| 82648 | Powder River | 24 |
| 82630 | Arminto | 0 |
| 82646 | Natrona | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 12 ZCTAs in Natrona County, Wyoming (US Census).