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Declo, Idaho
—  City  —
Location in Cassia County and the state of Idaho
Coordinates: 42°31′10″N 113°37′48″W / 42.51944°N 113.63°W / 42.51944; -113.63
Country United States
State Idaho
County Cassia
 - Total 0.3 sq mi (0.7 km2)
 - Land 0.3 sq mi (0.7 km2)
 - Water 0.0 sq mi (0.0 km2)
Elevation 4,219 ft (1,286 m)
Population (2000)
 - Total 338
 - Density 1,226.7/sq mi (473.6/km2)
Time zone Mountain (MST) (UTC-7)
 - Summer (DST) MDT (UTC-6)
ZIP code 83323
Area code(s) 208
FIPS code 16-20980
GNIS feature ID 0397613

Declo is a city in Cassia County, Idaho, United States. It is part of the Burley, Idaho Micropolitan Statistical Area. The population was 338 at the 2000 census. The world's largest potato processing company was founded in 1923 near Declo by a 14-year-old entrepreneur named J.R. Simplot. The corporate headquarters for the J. R. Simplot Company are now located in Boise.



Declo was originally named Marshfield. Its name was changed about 1916.[1]


Declo is located at 42°31′10″N 113°37′48″W / 42.51944°N 113.63°W / 42.51944; -113.63 (42.519441, -113.629978)[2].

According to the United States Census Bureau, the city has a total area of 0.3 square miles (0.7 km²), all of it land.


As of the census[3] of 2000, there were 338 people, 103 households, and 87 families residing in the city. The population density was 1,226.7 people per square mile (466.1/km²). There were 113 housing units at an average density of 410.1/sq mi (155.8/km²). The racial makeup of the city was 75.44% White, 0.59% African American, 0.30% Native American, 23.37% from other races, and 0.30% from two or more races. Hispanic or Latino of any race were 27.22% of the population.

There were 103 households out of which 48.5% had children under the age of 18 living with them, 66.0% were married couples living together, 14.6% had a female householder with no husband present, and 14.6% were non-families. 10.7% of all households were made up of individuals and 2.9% had someone living alone who was 65 years of age or older. The average household size was 3.28 and the average family size was 3.57.

In the city the population was spread out with 38.5% under the age of 18, 8.3% from 18 to 24, 26.6% from 25 to 44, 16.9% from 45 to 64, and 9.8% who were 65 years of age or older. The median age was 27 years. For every 100 females there were 98.8 males. For every 100 females age 18 and over, there were 110.1 males.

The median income for a household in the city was $36,528, and the median income for a family was $39,286. Males had a median income of $32,083 versus $18,750 for females. The per capita income for the city was $12,884. About 9.4% of families and 9.5% of the population were below the poverty line, including 9.0% of those under age 18 and none of those age 65 or over.


Declo is in the Cassia County School District.

Declo is zoned to:

  • Declo Elementary School
  • Declo Junior High School
  • Declo High School

All of the schools are in the city of Declo.


  1. ^ Jenson, Andrew. Encyclopedic History of the Church of Jesus Christ of Latter-day Saints. (Salt Lake City: Deseret News Press, 1941) p. 176
  2. ^ "US Gazetteer files: 2000 and 1990". United States Census Bureau. 2005-05-03. Retrieved 2008-01-31.  
  3. ^ "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.  

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