| ZIP Codes: | 11 ZIP Codes (7 Standard, 3 PO Box, 1 Unique) [See All] |
| Area Codes: | 208 / 986 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:53:14 PM |
| Population: | 129,351 [See All] |
| FIPS: | 16019 |
| CBSA: | Idaho Falls, ID |
| Land Area: | 1,228 sq mi |
| Water Area: | 31 sq mi |
| Coordinates: | 43.4751, -111.8722 |
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129,351 residents live across 11 ZIPs covering 1,228 sq mi, served by 5 distinct USPS-recognized cities.
Population moved from 106,545 to 129,351 from 2014 to 2024 — a +21.4% change. 7 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 83406 (Idaho Falls, $86,991 median) and poorest ZIP 83402 (Idaho Falls, $74,517) are 19.1 miles apart — a 1.2× income gap across local geography.
Median home values vary 1.3× across this county — from $334,900 in 83402 (Idaho Falls) to $426,500 in 83427 (Iona).
Density varies 11× across the county — from 109 people/sq mi in 83402 (Idaho Falls) to 1,193 in 83427 (Iona).
Most of the decade's growth concentrated around Idaho Falls — top growth ZIPs averaged +42.7% over the past ten years ( 83427 , 83404 and 83406 ).
Educational attainment ranges from 27.0% bachelor's+ in 83427 (Iona) to 39.8% in 83406 (Idaho Falls) — the breadth of educational profiles across the area.
Within Idaho, this is the #4 most populous of 46 counties and ranks #9 for median household income with the #11 fastest decade growth .
Hosts 1 single-entity Unique ZIP: 83415Idaho National Lab .
Weighted by population, the typical household earns about $79,686 across the county — reflecting what a typical resident sees, not a simple ZIP average.
33.1% of adults age 25+ hold a bachelor's degree or higher (26,472 of 79,869 reporting). The most-educated ZIPs cluster around Idaho Falls.
7 Standard delivery, 3 PO Box only, 1 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 83401 | Idaho Falls | Standard | 47,972 | $78,497 | 149.4 | 19.5% |
| 83402 | Idaho Falls | Standard | 29,994 | $74,517 | 275.5 | 16.7% |
| 83404 | Idaho Falls | Standard | 27,500 | $82,103 | 26.8 | 25.0% |
| 83406 | Idaho Falls | Standard | 19,696 | $86,991 | 50.2 | 22.9% |
| 83427 | Iona | Standard | 2,931 | $84,009 | 2.5 | 80.0% |
| 83428 | Irwin | Standard | 576 | $68,750 | 164.1 | 77.8% |
| 83454 | Ucon | PO Box | 409 | $66,607 | 0.0 | -23.8% |
| 83449 | Swan Valley | Standard | 273 | $82,368 | 559.5 | 43.7% |
| 83403 | Idaho Falls | PO Box | — | — | 0.0 | — |
| 83405 | Idaho Falls | PO Box | — | — | 0.0 | — |
| 83415 | Idaho Falls | Unique | — | — | 0.0 | — |