Declo is a city in Cassia County, Idaho, home to about 477 people across 0.3 square miles. It has no ZIP code of its own: it’s part of 83323.
Homes sold for a median of $225 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Declo. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Declo’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)141 miles away |
|---|---|
| Closer regional airport | Pocatello Regional Airport (PIH)50 miles away |
| Nearest city of 250,000+ | Reno, NV392 miles away |
| Nearest city of 1 million+ | Phoenix, AZ622 miles away |
Straight-line distances from the center of Declo; 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.
Declo had 338 residents in the 2020 census, up 0% since 2000.
It’s the 149th largest of 232 towns in Idaho by population.
Cassia County grew from 3,951 residents in 1900 to 24,655 in 2020.
Cassia County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 89°F in summer, and winter lows average 18°F. About 10 inches of rain and melted snow fall in a typical year, with about 21 inches of snow.
Source: NOAA 1991–2020 climate normals, Minidoka Dam, ID weather station (11 miles away).
9,709 jobs at 773 businesses in Cassia 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 Cassia County Joint District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Declo Elementary SchoolDeclo | Pre-K–5 | 453 | Public | 9.8 mi |
| Declo Jr. High SchoolDeclo | 6–8 | 249 | Public | 9.7 mi |
| Declo Senior High SchoolDeclo | 9–12 | 326 | Public | 9.6 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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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.