16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 55125 | Saint Paul | 44,185 |
| 55016 | Cottage Grove | 40,695 |
| 55082 | Stillwater | 36,277 |
| 55129 | Saint Paul | 34,120 |
| 55128 | Saint Paul | 29,384 |
| 55038 | Hugo | 25,061 |
| 55042 | Lake Elmo | 13,705 |
| 55115 | Saint Paul | 8,949 |
| 55071 | Saint Paul Park | 5,719 |
| 55055 | Newport | 4,754 |
| 55073 | Scandia | 4,169 |
| 55003 | Bayport | 3,905 |
| 55043 | Lakeland | 3,424 |
| 55001 | Afton | 3,027 |
| 55047 | Marine On Saint Croix | 2,244 |
| 55090 | Willernie | 401 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Washington County, Minnesota (US Census).