Irwin, Idaho
16 topographic sheets cover this place, the earliest surveyed in 1932 and the latest in 1986. It stands in the Swan Valley census division. It lies in ZIP code area 83449. It lies near Flatiron. The Survey maps it on the Swan Valley quadrangle. 259 people lived here at the 2020 count. It stands 5,325 feet above sea level.
Population over time
2 figuresIrwin grew from 219 to 259 between 2010 and 2020. These are the recorded population figures Wikidata holds for this place, reached through the Geographic Names Information System number this page is keyed on rather than by name, so they belong to this place and not to another of the same name. Most are census counts, but not all are: an early figure may be a founding or settlement estimate, and an estimate published within five years of a census is left out. The change column is computed, and is left blank where more than 20 years separate a figure from the one before it, because a gap that long is not a change between two counts.
| Year | People | Change |
|---|---|---|
| 2010 | 219 | |
| 2020 | 259 | +40 (+18%) |
Topographic sheets covering this place
8 surveys from 16 printed sheetsMatched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.
- 1932 USGS Irwin quadrangle1:125000
- 1932 USGS Irwin quadrangle1:96000
- 1935 USGS Irwin quadrangle1:125000, 3 printings
- 1955 USGS Driggs quadrangle1:250000, 3 printings
- 1958 USGS Driggs quadrangle1:250000, 2 printings
- 1962 USGS Driggs quadrangle1:250000
- 1966 USGS Swan Valley quadrangle1:24000, 3 printings
- 1986 USGS Palisades quadrangle1:100000, 2 printings
Fires near this place
39 since 1992Regional context, not property-specific evidence. The federal wildfire occurrence database lists 39 fires within 5 miles of Irwin between 1992 and 2015, burning about 292 acres in total. 28 started naturally. 3 were recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.
| Reported cause | Fires |
|---|---|
| Natural | 28 |
| Recreation and ceremony | 3 |
| Debris and open burning | 3 |
| Arson/incendiarism | 3 |
| Power generation/transmission/distribution | 1 |
| Missing data/not specified/undetermined | 1 |
The most recent of them, most recent first, with the day each was reported and the service that recorded it.
| Date | Cause | Size | Reported by | Name on the report |
|---|---|---|---|---|
| 17 September 2000 | Natural | 1.0 acres | Caribou-Targhee National Forest | RIVER |
| 12 September 2000 | Natural | under an acre | Caribou-Targhee National Forest | ROCKY RIDGE |
| 10 September 1994 | Natural | 1.0 acres | Caribou-Targhee National Forest | not named |
| 7 August 2006 | Natural | under an acre | Caribou-Targhee National Forest | INDIAN |
| 30 August 2002 | Natural | under an acre | Caribou-Targhee National Forest | ROLLER |
| 30 August 2001 | Natural | under an acre | Caribou-Targhee National Forest | LONG GULCH |
| 27 August 2012 | Natural | under an acre | Caribou-Targhee National Forest | WORK CENTER |
| 27 August 2012 | Natural | under an acre | Caribou-Targhee National Forest | WOODPECKER |
Settlements close enough to share some of these fires:
Mines and quarries near this place
10 of 16 shownRegional context, not property-specific evidence. The federal mineral resources record lists 16 workings within 5 miles of Irwin: 11 prospects, 3 occurrences, 1 producer, 1 past producer. 1 still produces. What was taken out: Phosphorus-Phosphates, Bentonite, Geothermal, Sand and Gravel, Construction. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.
| Where | Site | Commodity | Status | Recorded |
|---|---|---|---|---|
| Gravel Pit | Sand and Gravel, Construction | Past Producer | ||
| Snake River Area (Bentonite Occurrence) | Bentonite | Occurrence | Bentonite | |
| Unnamed Hot Spring | Geothermal | Producer | ||
| E. A. Rex Mining Co. Phosphate Lease | Phosphorus-Phosphates | Occurrence | ||
| Long Gulch | Phosphorus-Phosphates | Prospect | ||
| Papoose Creek Phosphate Deposit | Phosphorus-Phosphates | Occurrence | ||
| Unnamed Prospect | Phosphorus-Phosphates | Prospect | ||
| Unnamed Prospect | Phosphorus-Phosphates | Prospect | ||
| Unnamed Prospect | Phosphorus-Phosphates | Prospect | ||
| Unnamed Prospect | Phosphorus-Phosphates | Prospect |
Storms near this place
3 since 2022Regional context, not property-specific evidence. The National Weather Service names Irwin in 3 storm reports between 2022 and 2025: 2 hail, 1 thunderstorm wind. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.
| When | Event | Place named | Harm | What the report says |
|---|---|---|---|---|
| May 2025 | Thunderstorm Wind | Irwin | - | Wind gusts caused power outages in the Irwin area. |
| August 2022 | Hail | Irwin | - | Quarter sized hail photographed near Irwin. |
| August 2022 | Hail | Irwin | - | Spotter reported 1 inch hail just south of Irwin. |
Nearest settlements
The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.
| Map | Place | Distance | Sheets |
|---|---|---|---|
| Swan Valley | 4.0 miles | 16 | |
| Palisades | 5.8 miles | 16 | |
| Keenan City (historical) | 18.6 miles | 16 | |
| Guyaz | 19.1 miles | 13 | |
| Herman | 19.8 miles | 15 | |
| Caribou City (historical) | 21.2 miles | 16 | |
| Dehlin | 21.8 miles | 13 | |
| Gray | 25.1 miles | 14 |
Elsewhere
Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.
| Wikipedia article on Irwin | An encyclopaedic summary. Its text is share-alike, so it is linked here rather than copied. |
| Wikidata item Q1512341 | The structured record the population and elevation above come from. Public domain (CC0). |
Provenance
This settlement is recorded in the Geographic Names Information System as feature 397812. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.
Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.







