Gem County, Idaho ZIP codes
4 ZIP codes are in Gem County, plus 3 that cross in from neighboring counties. It's part of the Boise City, ID metro area.
- ZIP codes
- 4
- Population in these ZIPs
- 20,075
- Avg. median income
- $66,300population-weighted
- Cities & towns
- 4
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Gem County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 83617 | Emmett | 19,058 | $65,291 | $456,800 |
| 83636 | Letha | 109 | $85,761 | — |
| 83657 | Ola | 156 | $51,183 | $606,000 |
| 83670 | Sweet | 752 | $91,685 | $644,600 |
ZIP codes partly in Gem County
These ZIP codes are mostly in a neighboring county but cover part of Gem County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 83607 | Caldwell | Canyon County | 35,491 | $85,399 | $452,800 |
| 83616 | Eagle | Ada County | 35,413 | $125,203 | $807,900 |
| 83629 | Horseshoe Bend | Boise County | 1,749 | $72,500 | $521,000 |
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 Gem County
Nearby counties
Frequently asked questions
How many ZIP codes are in Gem County, Idaho?
4 ZIP codes are mainly in Gem County, and 3 more ZIP codes from neighboring areas reach partly into it.
What cities are in Gem County?
ZIP codes in Gem County use the city names Emmett, Letha, Ola and Sweet.
What metro area is Gem County in?
Gem County is part of the Boise City, ID metropolitan statistical area.