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ZIP codes in Oliver County

6 ZIPs touch Oliver County, North Dakota. The blue dashed line is the county border; orange ZIPs reach into it.

6

ZIP codes

6

cross the county line

39,931

people in these ZIPs

53

counties in ND

Most people

← All North Dakota ZIP codes

Oliver County ZIP list

More counties in North Dakota

All 53 counties in North Dakota

Questions people actually ask

How many ZIP codes are in Oliver County, North Dakota?

6 ZIP codes reach into Oliver County. 6 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Oliver County has the most people?

58554 (Mandan) has about 29,479 residents, the most of any ZIP touching Oliver County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Oliver 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 Oliver 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