Warm River is a city in Fremont County, Idaho across 0.7 square miles. It has no ZIP code of its own: it’s part of 83420.
Homes sold for a median of $228 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Ashton; part is in Warm River
Each card is that ZIP code’s whole market, including any part outside Warm River. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Warm River’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Warm River well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Salt Lake City International Airport (SLC)225 miles away |
|---|---|
| Closer regional airport | Jackson Hole Airport (JAC)44 miles away |
| Nearest city of 250,000+ | Denver, CO447 miles away |
| Nearest city of 1 million+ | Phoenix, AZ722 miles away |
Straight-line distances from the center of Warm River; 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.
Warm River had 4 residents in the 2020 census, down 60% since 2000.
Fremont County grew from 12,821 residents in 1900 to 13,388 in 2020.
Fremont County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 13°F. About 19.7 inches of rain and melted snow fall in a typical year, with about 70 inches of snow.
Source: NOAA 1991–2020 climate normals, Ashton 1n, ID weather station (4 miles away).
2,147 jobs at 395 businesses in Fremont County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
9 doctors and other health care providers list an office in Warm River.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Specialist doctors | 2 |
| Mental health providers | 2 |
| Physical and occupational therapists | 3 |
| Chiropractors | 1 |
| Pharmacies | 2 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Grocery stores
Libraries
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Fremont County Joint District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Ashton Elementary SchoolAshton | Pre-K–5 | 228 | Public | 4.1 mi |
| North Fremont Jr./Sr. High SchoolAshton | 6–12 | 316 | Public | 4.0 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 Ashton and Drummond.
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.