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Warm River

A city of 4 people in Idaho
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About Warm River

City in Idaho, United States
4Population
0.7 sq miArea
5,295 ftElevation

Warm River is a city in Fremont County, Idaho, United States. The population was 4 at the 2020 census, making it the least populous city in Idaho. It is part of the Rexburg, Idaho Micropolitan Statistical Area.

From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

Town numbers

Area code208
Living in Warm River

Health in Warm River

Compared with Idaho

7better than ID·3worse

of 32 measures CDC estimates. The other 22 are too close to call.

BetterToo close to callWorse

What stands out

Care nearby

Teton Valley HospitalDriggs · 29.2 mi · ER · rural critical access
Grand Peaks Dental-Saint AnthonySaint Anthony · 20.7 mi · sliding-scale fees
Primary careShortage · county-wide
DentalNo shortage
Mental healthShortage · county-wide
CDC PLACES 2025 · modeled estimates for adults · ZIP code 83420 · CMS · HRSAHealth in Warm River →

Natural hazards in Warm River

82
Very high

Expected storm and flood damage is higher than in 82% of U.S. communities.

🌊 Inland flooding🏔️ Avalanches🔥 Wildfire
FEMA National Risk Index December 2025 · OpenFEMANatural hazards in Warm River →

Climate in Warm River

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Warm River has cold, snowy winters and pleasant summers, with very little rain. A typical July afternoon reaches 82°, a January night drops to 11°, and about 70 inches of snow falls in a normal winter.

30° / 12°Winter
53° / 28°Spring
79° / 46°Summer
56° / 29°Fall
NOAA U.S. Climate Normals, 1991–2020Climate in Warm River →

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Nearest: Fremont District - AshtonAshton · 6.9 miles · 40 hrs a week

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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01