This list of current cities, towns, unincorporated communities, counties, and other recognized places in the U.S. state of Idaho also includes information on the number and names of counties in which the place lies, and its lower and upper ZIP Code bounds, if applicable.
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| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code | |
|---|---|---|---|---|---|
| Idaho City | 1 | Boise County | 83631 | ||
| Idaho Falls | 1 | Bonneville County | 83401 | 06 | |
| Idahome | 1 | Cassia County | 83323 | ||
| Idavada | 1 | Twin Falls County | |||
| Idmon | 1 | Clark County | 83423 | ||
| Indian | 1 | Bonneville County | |||
| Indian Cove | 1 | Owyhee County | 83627 | ||
| Indian Grove | 1 | Cassia County | |||
| Indian Head Rock | 1 | Camas County | |||
| Indian Valley | 1 | Adams County | 83632 | ||
| Ingard | 1 | Payette County | |||
| Inkom | 1 | Bannock County | 83245 | ||
| Iona | 1 | Bonneville County | 83427 | ||
| Ireland Springs | 1 | Oneida County | |||
| Irwin | 1 | Bonneville County | 83428 | ||
| Island Park | 1 | Fremont County | 83429 | ||
| Iversons | 1 | Cassia County |
| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code |
|---|---|---|---|---|
| Jackson | 1 | Cassia County | 83350 | |
| Jacques | 1 | Nez Perce County | 83524 | |
| Jamestown | 1 | Bingham County | 83274 | |
| Jaype | 1 | Clearwater County | ||
| Jenkins Will | 1 | Fremont County | ||
| Jenness | 1 | Gem County | ||
| Jensen | 1 | Madison County | ||
| Jerome | 1 | Jerome County | 83338 | |
| Jersey | 1 | Clearwater County | ||
| Jims Spur | 1 | Benewah County | ||
| Joel | 1 | Latah County | 83843 | |
| Johnsons Mill | 1 | Clearwater County | ||
| Jolley | 1 | Madison County | ||
| Jonathan | 1 | Washington County | 83672 | |
| Jordan | 1 | Clearwater County | ||
| Joseph | 1 | Idaho County | ||
| Josephson | 1 | Canyon County | ||
| Judge Town | 1 | Clearwater County | 83546 | |
| Judkins | 1 | Teton County | ||
| Juliaetta | 1 | Latah County | 83535 | |
| Juniper | 1 | Oneida County | 83243 | |