16 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 55125 | Saint Paul | 44,929 |
| 55016 | Cottage Grove | 39,925 |
| 55082 | Stillwater | 36,414 |
| 55129 | Saint Paul | 32,016 |
| 55128 | Saint Paul | 28,945 |
| 55038 | Hugo | 24,246 |
| 55042 | Lake Elmo | 13,156 |
| 55115 | Saint Paul | 8,926 |
| 55071 | Saint Paul Park | 5,807 |
| 55055 | Newport | 4,460 |
| 55073 | Scandia | 4,145 |
| 55003 | Bayport | 3,948 |
| 55043 | Lakeland | 3,471 |
| 55001 | Afton | 2,956 |
| 55047 | Marine On Saint Croix | 2,230 |
| 55090 | Willernie | 377 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Washington County, Minnesota (US Census).