Irwin is a city in Bonneville County, Idaho, home to about 236 people across 2.5 square miles. Its ZIP code is 83428, and parts of 83449 are in Irwin too.
Homes sold for a median of $418 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Irwin; also Swan Valley
Mostly Swan Valley; part is in Irwin
Each card is that ZIP code’s whole market, including any part outside Irwin. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Irwin’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Salt Lake City International Airport (SLC)183 miles away |
|---|---|
| Closer regional airport | Jackson Hole Airport (JAC)30 miles away |
| Nearest city of 250,000+ | Denver, CO414 miles away |
| Nearest city of 1 million+ | Phoenix, AZ679 miles away |
Straight-line distances from the center of Irwin; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Irwin had 259 residents in the 2020 census, up 65% since 2000.
It’s the 183rd largest of 232 towns in Idaho by population.
Bonneville County grew from 17,501 residents in 1920 to 123,964 in 2020.
Bonneville County, 1920–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 11°F. About 20.2 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Swan Valley, ID weather station (3 miles away).
63,119 jobs at 4,197 businesses in Bonneville County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Public schools here are run by Swan Valley Elementary District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Swan Valley Elementary SchoolIrwin | Pre-K–8 | 55 | Public | 2.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Swan Valley.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.