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ZIP codes in Jefferson County

10 ZIPs touch Jefferson County, Idaho. The blue dashed line is the county border; orange ZIPs reach into it.

10

ZIP codes

8

cross the county line

111,490

people in these ZIPs

44

counties in ID

Most people

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Jefferson County ZIP list

More counties in Idaho

All 44 counties in Idaho

Questions people actually ask

How many ZIP codes are in Jefferson County, Idaho?

10 ZIP codes reach into Jefferson County. 8 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Jefferson County has the most people?

83401 (Idaho Falls) has about 47,972 residents, the most of any ZIP touching Jefferson County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Jefferson 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 Jefferson 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