There are 16 zip codes in Washington County, Minnesota. The most populated is 55125, located in Saint Paul. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5512545,835Saint Paul
5501638,842Cottage Grove
5508236,154Stillwater
5512929,714Saint Paul
5512828,811Saint Paul
5503823,764Hugo
5504212,647Lake Elmo
551158,815Saint Paul
550715,895Saint Paul Park
550554,163Newport
550734,061Scandia
550033,902Bayport
550433,540Lakeland
550012,974Afton
550472,296Marine On Saint Croix
55090376Willernie

Zip Codes in Washington County, Minnesota by Population (2024)