ZIP codes in Koochiching County
15 ZIPs touch Koochiching County, Minnesota. The blue dashed line is the county border; orange ZIPs reach into it.
15
ZIP codes
7
cross the county line
16,811
people in these ZIPs
87
counties in MN
Most people
Koochiching County ZIP list
More counties in Minnesota
- Isanti County13
- Itasca County33
- Jackson County13
- Kanabec County9
- Kandiyohi County16
- Kittson County11
- Lac qui Parle County10
- Lake County9
- Lake of the Woods County5
- Le Sueur County13
- Lincoln County11
- Lyon County14
Questions people actually ask
How many ZIP codes are in Koochiching County, Minnesota?
15 ZIP codes reach into Koochiching County, including 1 PO Box or single-address ZIPs placed by the town they serve. 7 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Koochiching County has the most people?
56649 (International Falls) has about 8,825 residents, the most of any ZIP touching Koochiching County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Koochiching 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 Koochiching 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