ZIP codes in Idaho County
16 ZIPs touch Idaho County, Idaho. The blue dashed line is the county border; orange ZIPs reach into it.
16
ZIP codes
4
cross the county line
31,601
people in these ZIPs
44
counties in ID
Most people
Idaho County ZIP list
More counties in Idaho
- Custer County7
- Elmore County9
- Franklin County7
- Fremont County11
- Gem County7
- Gooding County6
- Jefferson County10
- Jerome County5
- Kootenai County15
- Latah County13
- Lemhi County12
- Lewis County7
Questions people actually ask
How many ZIP codes are in Idaho County, Idaho?
16 ZIP codes reach into Idaho County, including 1 PO Box or single-address ZIPs placed by the town they serve. 4 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Idaho County has the most people?
83638 (McCall) has about 7,750 residents, the most of any ZIP touching Idaho County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Idaho 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 Idaho 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