Declo, Idaho

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title: "Declo, Idaho" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["cities-in-cassia-county,-idaho", "cities-in-idaho", "burley,-idaho-micropolitan-area"] topic_path: "geography" source: "https://en.wikipedia.org/wiki/Declo,_Idaho" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::data[format=table title="Infobox settlement"]

Field	Value
official_name	Declo, Idaho
settlement_type	City
image_skyline	File:Declo.png
image_map	File:Cassia County Idaho Incorporated and Unincorporated areas Declo Highlighted 1620980.svg
mapsize	250px
map_caption	Location of Declo in Cassia County, Idaho.
pushpin_map	USA
pushpin_map_caption	Location in the United States
subdivision_type	Country
subdivision_name	United States
subdivision_type1	State
subdivision_name1	Idaho
subdivision_type2	County
subdivision_name2	Cassia
leader_title	Mayor
leader_name	Lance Osterhout
unit_pref	Imperial
area_footnotes
area_total_km2	0.72
area_total_sq_mi	0.28
area_land_km2	0.72
area_land_sq_mi	0.28
area_water_km2	0.00
area_water_sq_mi	0.00
population_footnotes
population_total	343
population_as_of	2010
population_density_km2	514.76
population_density_sq_mi	1332.13
timezone	Mountain (MST)
utc_offset	-7
timezone_DST	MDT
utc_offset_DST	-6
elevation_footnotes
elevation_ft	4213
coordinates
postal_code_type	ZIP code
postal_code	83323
area_code	208
blank_name	FIPS code
blank_info	16-20980
blank1_name	GNIS feature ID
blank1_info	2410308
::

Declo is a city in Cassia County, Idaho, United States. It is part of the Burley, Idaho micropolitan area. The population was 338 at the time of the 2020 Census, down from 343 in 2010.

History

The city was originally named Marshfield. In 1916, the name was changed to Declo. The Central Post Office told the community to choose another name not to exceed five letters. the last initials of the first five men to enter the post office were recorded: August Detlef, George Eldredge, Hyrum Lewis, James Cooley, and Carl Osterhout. The Central Post Office said they preferred Declo instead of Delco, and such it was named.

The J. R. Simplot Company was founded in 1923 near Declo by 14-year-old entrepreneur J. R. Simplot, who had moved to the area with his family as a toddler. The corporate headquarters for the company are now located in Boise.

Geography

According to the United States Census Bureau, the city has a total area of 0.28 sqmi, all of it land.

The Hillside Letter "D" can be seen in the southeast ()

Climate

According to the Köppen Climate Classification system, Declo has a semi-arid climate, abbreviated "BSk" on climate maps.

Demographics

| 1920 = 22 | 1930 = 196 | 1940 = 238 | 1950 = 219 | 1960 = 237 | 1970 = 251 | 1980 = 276 | 1990 = 279 | 2000 = 338 | 2010 = 343 | 2020 = 338 | footnote = U.S. Decennial Census

2010 census

As of the census of 2010, there were 343 people, 115 households, and 87 families residing in the city. The population density was 1225.0 PD/sqmi. There were 127 housing units at an average density of 453.6 /sqmi. The racial makeup of the city was 85.1% White, 4.1% Native American, 9.9% from other races, and 0.9% from two or more races. Hispanic or Latino of any race were 15.2% of the population.

There were 115 households, of which 45.2% had children under the age of 18 living with them, 51.3% were married couples living together, 15.7% had a female householder with no husband present, 8.7% had a male householder with no wife present, and 24.3% were non-families. 21.7% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.98 and the average family size was 3.44.

The median age in the city was 29.8 years. 35.6% of residents were under the age of 18; 8.7% were between the ages of 18 and 24; 22.3% were from 25 to 44; 22.4% were from 45 to 64; and 10.8% were 65 years of age or older. The gender makeup of the city was 50.1% male and 49.9% female.

2000 census

As of the census of 2000, there were 338 people, 103 households, and 87 families residing in the city. The population density was 1,226.7 PD/sqmi. There were 113 housing units at an average density of 410.1 /sqmi. 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.

Education

Declo is part of the Cassia County School District.

The following schools are located in Declo:

Declo Elementary School
Declo Junior High School
Declo High School

Notable people

Kelly Anthon, current President Pro Tempore of the Idaho Senate (former Majority Leader of the Idaho Senate)
J. R. Simplot, founder of the J. R. Simplot Company

References

"Declo votes for ‘new, fresh ideas’; Burley reelects 3 to city council".
"2019 U.S. Gazetteer Files". United States Census Bureau.
{{GNIS. 2410308
""Explore Census Data", 2020 U.S Census - Declo, Idaho".
Jenson, Andrew. ''Encyclopedic History of the Church of Jesus Christ of Latter-day Saints''. (Salt Lake City: Deseret News Press, 1941) p. 176
Welch, Laurie. "BLOG: How Cassia County Towns Got their Names".
Temple, Robert D. ''Edge Effects: The Border-Name Places'', (2nd edition, 2009), iUniverse, {{ISBN. 978-0-595-47758-6, page 321.
"US Gazetteer files 2010". [[United States Census Bureau]].
"Declo, Idaho Köppen Climate Classification (Weatherbase)".
"Census of Population and Housing".
"U.S. Census website". [[United States Census Bureau]].
"U.S. Census website". [[United States Census Bureau]].

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