ZIP code · Irwin · Idaho · United States
ZIP code 83428 — Irwin
ZIP code 83428 serves Irwin, Idaho.
- Postal code
- 83428Single source Value from one source, not cross-checked.
- City
- Irwin
- County
- Bonneville FIPS 16019
- State
- Idaho
- Country
- United States
- Coordinates
- 43.3861, -111.2527 — precision precise (locality)
View on OpenStreetMap - Population
- 589 (ZCTA, ACS 5-year)
- Population density
- 2 / sq mi
- Land area
- 249 sq mi (644.8 km²) (ZCTA, ACS 5-year)
- Median household income
- $67,188
- Per-capita income
- $68,346
- Median age
- 56.1
- Households
- 246
- Housing units
- 475
- Median home value
- $540,400
- Congressional district
- ID-2 (119th Congress)
- USDA hardiness zone
- 6a (-10 to -5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Boise (UTC−7 / UTC−6 DST)
- Area code
- 208Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 83428 with another ZIP · ZIPs within 25 miles · distance from 83428
Map of ZIP code 83428
Climate — monthly normals
Warmest month Jul (avg high 85°F), coldest Jan (avg low 11°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 30 | 35 | 45 | 56 | 66 | 75 | 85 | 84 | 75 | 59 | 43 | 32 |
| Avg low °F | 11 | 14 | 22 | 27 | 35 | 41 | 46 | 44 | 37 | 29 | 20 | 12 |
| Precip in | 1.9 | 1.3 | 1.5 | 1.9 | 2.5 | 2.1 | 1.3 | 1.3 | 1.6 | 1.8 | 1.6 | 1.4 |
NOAA 1991–2020 climate normals from the nearest station: SWAN VALLEY (3.8 mi) · NOAA NCEI
Places in ZIP 83428
- 1 schools
- 1 parks
- 1 gas stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page