Madison County, Idaho

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Madison County, Idaho
Madison County Courthouse, Idaho.jpg
Madison County Courthouse
Seal of Madison County, Idaho
Map of Idaho highlighting Madison County
Location in the state of Idaho
Map of the United States highlighting Idaho
Idaho's location in the U.S.
Founded February 18, 1913
Named for James Madison
Seat Rexburg
Largest city Rexburg
 • Total 473 sq mi (1,225 km2)
 • Land 469 sq mi (1,215 km2)
 • Water 4.0 sq mi (10 km2), 0.8%
 • (2010) 37,536
 • Density 80/sq mi (31/km²)
Congressional district 2nd
Time zone Mountain: UTC-7/-6

Madison County is a county located in the U.S. state of Idaho. As of the 2010 census, the population was 37,536.[1] The county seat and largest city is Rexburg.[2]

Madison County is part of the Rexburg, ID Micropolitan Statistical Area, which is also included in the Idaho Falls-Rexburg-Blackfoot, ID Combined Statistical Area.


The area was originally settled by members of The Church of Jesus Christ of Latter-day Saints (Mormons). Before February 1913, the county was part of neighboring Fremont County. The newly established county was named for American president James Madison.[3] BYU-Idaho, formerly Ricks College (named after early local LDS settler Thomas Edwin Ricks) is located here. Madison County was declared a national disaster area after the Teton Dam flood of June 5, 1976.

Government and politics[edit]

Similar to other Idaho counties, an elected three-member county commission heads the county government. Other elected officials include clerk, treasurer, sheriff, assessor, coroner, and prosecutor.[4]

With a strongly conservative and Mormon population, Madison County is one of the most staunchly Republican counties in the United States. Since 1980 no Republican presidential candidate has failed to carry the county with less than 59 percent of the vote. In that same period Republican presidential candidates polled more than 90 percent of the county's vote on three occasions, Ronald Reagan in 1984,[5] George W. Bush in 2004,[6] and Mitt Romney in 2012.[7] John McCain came close to this level in 2008, drawing 85 percent of the vote.[8]

At the state level Madison County is located in Legislative District 34,[9] which currently has an all-Republican delegation in the Idaho Legislature.[10]


According to the U.S. Census Bureau, the county has a total area of 473 square miles (1,230 km2), of which 469 square miles (1,210 km2) is land and 4.0 square miles (10 km2) (0.8%) is water.[11] It is the third-smallest county in Idaho by area.

Adjacent counties[edit]

Major highways[edit]

National protected area[edit]


Historical population
Census Pop.
1920 9,167
1930 8,316 −9.3%
1940 9,186 10.5%
1950 9,156 −0.3%
1960 9,417 2.9%
1970 13,452 42.8%
1980 19,480 44.8%
1990 23,674 21.5%
2000 27,467 16.0%
2010 37,536 36.7%
Est. 2014 38,038 [12] 1.3%
U.S. Decennial Census[13]
1790-1960[14] 1900-1990[15]
1990-2000[16] 2010-2013[1]

As of the census[17] of 2000, there were 27,467 people, 7,129 households, and 4,854 families residing in the county. The population density was 58 people per square mile (22/km²). There were 7,630 housing units at an average density of 16 per square mile (6/km²). The racial makeup of the county was 95.50% White, 0.24% Black or African American, 0.33% Native American, 0.57% Asian, 0.18% Pacific Islander, 2.23% from other races, and 0.95% from two or more races. 3.92% of the population were Hispanic or Latino of any race. 30.6% were of English, 10.7% German, 10.2% American and 5.3% Danish ancestry according to Census 2000.

There were 7,129 households out of which 39.00% had children under the age of 18 living with them, 60.10% were married couples living together, 5.70% had a female householder with no husband present, and 31.90% were non-families. 12.70% of all households were made up of individuals and 5.60% had someone living alone who was 65 years of age or older. The average household size was 3.66 and the average family size was 3.70.

In the county the population was spread out with 26.20% under the age of 18, 39.90% from 18 to 24, 16.00% from 25 to 44, 11.90% from 45 to 64, and 6.00% who were 65 years of age or older. The median age was 21 years. For every 100 females there were 90.90 males. For every 100 females age 18 and over, there were 83.60 males.

The median income for a household in the county was $32,607, and the median income for a family was $40,880. Males had a median income of $29,299 versus $18,628 for females. The per capita income for the county was $10,956. About 10.10% of families and 30.50% of the population were below the poverty line, including 11.70% of those under age 18 and 10.10% of those age 65 or over.



Unincorporated community[edit]

See also[edit]


External links[edit]

Coordinates: 43°47′N 111°40′W / 43.79°N 111.66°W / 43.79; -111.66