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ZIP codes in Otter Tail County

35 ZIPs touch Otter Tail County, Minnesota. The blue dashed line is the county border; orange ZIPs reach into it.

35

ZIP codes

18

cross the county line

109,935

people in these ZIPs

87

counties in MN

Most people

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Otter Tail County ZIP list

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Questions people actually ask

How many ZIP codes are in Otter Tail County, Minnesota?

35 ZIP codes reach into Otter Tail County, including 1 PO Box or single-address ZIPs placed by the town they serve. 18 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Otter Tail County has the most people?

56537 (Fergus Falls) has about 19,856 residents, the most of any ZIP touching Otter Tail County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Otter Tail 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 Otter Tail 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