Custer County, Idaho ZIP codes
5 ZIP codes are in Custer County, plus 2 that cross in from neighboring counties.
- ZIP codes
- 5
- Population in these ZIPs
- 4,198
- Avg. median income
- $55,000population-weighted
- Cities & towns
- 5
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ZIP codes in Custer County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 83226 | Challis | 2,100 | $36,458 | $341,700 |
| 83227 | Clayton | 200 | — | $469,300 |
| 83235 | Ellis | 1 | — | — |
| 83251 | Mackay | 1,443 | $73,482 | $318,700 |
| 83278 | Stanley | 454 | $81,602 | $831,100 |
ZIP codes partly in Custer County
These ZIP codes are mostly in a neighboring county but cover part of Custer County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 83253 | May | Lemhi County | 112 | — | — |
| 83255 | Moore | Butte County | 1,222 | $70,714 | $348,000 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Custer County
Nearby counties
Frequently asked questions
How many ZIP codes are in Custer County, Idaho?
5 ZIP codes are mainly in Custer County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Custer County?
ZIP codes in Custer County use the city names Challis, Clayton, Ellis, Mackay and Stanley.