Founded in 1849, Washington County is one of 87 counties in the state of Minnesota. Historically, Washington County was one of nine original counties; formed from residual St. Croix County and Wisconsin Territory. The city of Stillwater is the county seat. With FIPS code of 163, Washington County has a population of 272,256 and area of 391.70 square miles (1,014 km2).
List of all cities in Washington County, MN alphabetically
| City/Town | Postal Code | Area Code |
| Afton, MN | 55001 | 651 |
| Bayport, MN | 55003 | 651 |
| Baytown, MN | 55003 | 651 |
| Centerville, MN | 55038 | 651 |
| Columbus, MN | 55025 | 651 |
| 55038 | 651 | |
| Copas, MN | 55073 | 651 |
| Cottage Grove, MN | 55016 | 651 |
| Douglas, MN | 55003 | 651 |
| Forest Lake, MN | 55025 | 651 |
| Grant, MN | 55115 | 651 |
| Grey Cloud Island, MN | 55071 | 651 |
| Hugo, MN | 55038 | 651 |
| Lake Elmo, MN | 55042 | 651 |
| Lakeland, MN | 55043 | 651 |
| Landfall Village, MN | 55128 | 651 |
| Lino Lakes, MN | 55038 | 651 |
| Mahtomedi, MN | 55115 | 651 |
| Marine, MN | 55047 | 651 |
| Marine on Saint Croix, MN | 55047 | 651 |
| New Scandia, MN | 55047 | 651 |
| 55073 | 651 | |
| Newport, MN | 55055 | 651 |
| Oak Park Heights, MN | 55082 | 651 |
| Oakdale, MN | 55042 | 651 |
| 55128 | 651 | |
| Otisville, MN | 55073 | 651 |
| Pine Springs, MN | 55115 | 651 |
| 55128 | 651 | |
| Saint Croix, MN | 55047 | 651 |
| Saint Croix Beach, MN | 55043 | 651 |
| Saint Marys Point, MN | 55043 | 651 |
| Saint Paul, MN | 55115 | 651 |
| 55125 | 651 | |
| 55128 | 651 | |
| 55129 | 651 | |
| Saint Paul Park, MN | 55071 | 651 |
| Scandia, MN | 55073 | 651 |
| Stillwater, MN | 55082 | 651 |
| 55083 | 651 | |
| West Lakeland, MN | 55082 | 651 |
| White Bear Lake, MN | 55115 | 651 |
| Willernie, MN | 55090 | 651 |
| Woodbury, MN | 55125 | 651 |
| 55129 | 651 |