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County ZIP codes · Minnesota · FIPS 27163

Washington County, MN ZIP Codes

Washington County, Minnesota has 20 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 19 residential and 1 for PO boxes or a single organization. 16 of the residential ones lie mainly in Washington County and 3 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $93,210 in 55128 (Saint Paul) to $154,341 in 55042 (Lake Elmo) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Washington County?

55001 · Afton: $134k55003 · Bayport: $126k55016 · Cottage Grove: $121k55025 · Forest Lake: $98k55033 · Hastings: $104k55038 · Hugo: $131k55042 · Lake Elmo: $154k55043 · Lakeland: $103k55047 · Marine On Saint Croix: $107k55055 · Newport: $72k55071 · Saint Paul Park: $101k55073 · Scandia: $129k55082 · Stillwater: $115k55090 · Willernie: $85k55110 · Saint Paul: $101k55115 · Saint Paul: $124k55125 · Saint Paul: $119k55128 · Saint Paul: $93k55129 · Saint Paul: $144k55033550825502555038550475507355016551105512955001550425511555001 · Afton: $134k55003 · Bayport: $126k55016 · Cottage Grove: $121k55025 · Forest Lake: $98k55033 · Hastings: $104k55038 · Hugo: $131k55042 · Lake Elmo: $154k55043 · Lakeland: $103k55047 · Marine On Saint Croix: $107k55055 · Newport: $72k55071 · Saint Paul Park: $101k55073 · Scandia: $129k55082 · Stillwater: $115k55090 · Willernie: $85k55110 · Saint Paul: $101k55115 · Saint Paul: $124k55125 · Saint Paul: $119k55128 · Saint Paul: $93k55129 · Saint Paul: $144k550335508255025550385504755073550165511055129550015504255001 · Afton: $134k55003 · Bayport: $126k55016 · Cottage Grove: $121k55025 · Forest Lake: $98k55033 · Hastings: $104k55038 · Hugo: $131k55042 · Lake Elmo: $154k55043 · Lakeland: $103k55047 · Marine On Saint Croix: $107k55055 · Newport: $72k55071 · Saint Paul Park: $101k55073 · Scandia: $129k55082 · Stillwater: $115k55090 · Willernie: $85k55110 · Saint Paul: $101k55115 · Saint Paul: $124k55125 · Saint Paul: $119k55128 · Saint Paul: $93k55129 · Saint Paul: $144k550335508255025550385504755073550165511055129
The residential ZIP codes of Washington County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $101,296 and $128,723.

They carry 15 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 19 residential ZIP codes in Washington County

16 ZIP codes lie mainly in Washington County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Washington County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
55125 Saint Paul 44,185 2,879 $119k $416k 100%
55016 Cottage Grove 40,695 1,352 $121k $378k 100%
55082 Stillwater 36,277 458 $115k $474k 100%
55129 Saint Paul 34,120 1,747 $144k $535k 100%
55128 Saint Paul 29,384 2,617 $93k $313k 100%
55038 Hugo 25,061 496 $131k $423k 70%
55042 Lake Elmo 13,705 551 $154k $602k 100%
55115 Saint Paul 8,949 1,469 $124k $488k 100%
55071 Saint Paul Park 5,719 1,144 $101k $268k 100%
55055 Newport 4,754 1,312 $72k $378k 100%
55073 Scandia 4,169 149 $129k $462k 86%
55003 Bayport 3,905 1,883 $126k $377k 100%
55043 Lakeland 3,424 910 $103k $384k 100%
55001 Afton 3,027 112 $134k $674k 100%
55047 Marine On Saint Croix 2,244 77 $107k $498k 100%
55090 Willernie 401 3,518 $85k $331k 100%

Partly in Washington County

Residential ZIP codes mainly in another county that reach at least 1% into Washington County, by their share here
In this county
55025 Forest Lake 25,891 336 $98k $405k 39%
55110 Saint Paul 37,305 1,509 $101k $361k 31%
55033 Hastings 29,674 206 $104k $359k 21%

Download the 20 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

5 ZIP codes of Washington County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Washington County and in the neighboring counties
ZIPIn WashingtonElsewhere
5511031%Ramsey County 65%; Anoka County 4%
5503321%Dakota County 75%; Goodhue County 3%
5502539%Anoka County 54%; Chisago County 7%
5503870%Anoka County 30%
5507386%Chisago County 14%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Washington County without a residential area (GeoNames postal codes)
ZIPPostal name
55083Stillwater

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Washington County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Washington County's ZIP codes use 2 prefixes: 550 and 551.

Three-digit prefixes of Washington County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Washington County's
PrefixSectional centerHereAll codes
550 St Paul, MN (SCF 550) 15 74
551 St Paul, MN (SCF 550) 5 44

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.