ZIP codes in Monroe County
15 ZIPs touch Monroe County, Wisconsin. The blue dashed line is the county border; orange ZIPs reach into it.
15
ZIP codes
9
cross the county line
65,112
people in these ZIPs
72
counties in WI
Most people
Monroe County ZIP list
More counties in Wisconsin
- Manitowoc County22
- Marathon County31
- Marinette County16
- Marquette County14
- Menominee County4
- Milwaukee County49
- Oconto County19
- Oneida County15
- Outagamie County28
- Ozaukee County14
- Pepin County6
- Pierce County14
Questions people actually ask
How many ZIP codes are in Monroe County, Wisconsin?
15 ZIP codes reach into Monroe County, including 3 PO Box or single-address ZIPs placed by the town they serve. 9 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Monroe County has the most people?
54656 (Sparta) has about 18,160 residents, the most of any ZIP touching Monroe County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Monroe County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Monroe County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from