|Fremont County, Idaho|
Location in the U.S. state of Idaho
Idaho's location in the U.S.
|Founded||March 4, 1893|
|Named for||John C. Frémont|
|Largest city||St. Anthony|
|• Total||1,896 sq mi (4,911 km2)|
|• Land||1,864 sq mi (4,828 km2)|
|• Water||32 sq mi (83 km2), 1.7%|
|• ( 2017)||13,094|
|• Density||7.1/sq mi (2.7/km2)|
|Time zone||Mountain: UTC−7/ −6|
Fremont County is a county located in the U.S. state of Idaho. As of the 2010 census the county had a population of 13,242.  The county seat and largest city is St. Anthony.  The county was established in 1893, and was named for the explorer John C. Frémont. 
The county initially contained all of the northern portion of eastern Idaho north of Bonneville County. The counties of Jefferson and Madison were created from Fremont in 1913. Teton County was later created from Madison in 1915 and a portion of Butte was created from Jefferson in 1917. Clark County was also created from Fremont in 1919. 
The first fur trapping operation by a United States fur company west of the Rocky Mountains occurred in 1810 when Andrew Henry established a fort in the fall of 1810 on Conant Creek in southern Fremont County. Henry later moved the fort to the south bank of the Henry's Fork of the Snake River between present-day settlements of Salem and Parker. The fort was abandoned some time after 1811.  
At the time of early settlement, Fremont County was located on the northern edge of Oneida County. Mining, timber, and ranching operations commenced in the Island Park area prior to 1870. The establishment of Yellowstone National Park in 1872 also contributed to the eventual development of the Island Park area as a popular recreation area.  Construction of the Egin Canal commenced in 1879 and farming settlement of the Egin area followed. In 1883, Parker was established and settlement commenced at Teton. These settlements became part of Bingham County when it was created in 1885. Settlement at St. Anthony started in 1888 while the Ashton area settlement of Marysville commenced settlement in 1889. At the 1890 Census, Bingham County enumerated 301 residents in the precincts of Teton and Henry's Lake.  
According to the U.S. Census Bureau, the county has a total area of 1,896 square miles (4,910 km2), of which 1,864 square miles (4,830 km2) is land and 32 square miles (83 km2) (1.7%) is water.  The southern part of the county cover the northeast tip of the Snake River Basin, with the mountains of the continental divide forming its northern boundary. Montana lies to the north, and Wyoming to the east. A portion of Yellowstone National Park reaches into the county.
Fremont County is one of the few US counties to border two counties of the same name in different states. Fremont County borders two such pairs of counties-- Madison County, Idaho and Madison County, Montana and Teton County, Idaho and Teton County, Wyoming.
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2013 
As of the census  of 2000, there were 11,819 people, 3,885 households, and 3,030 families residing in the county. The population density was 6 people per square mile (2/km²). There were 6,890 housing units at an average density of 4 per square mile (1/km²). The racial makeup of the county was 91.41% White, 0.16% Black or African American, 0.51% Native American, 0.36% Asian, 0.06% Pacific Islander, 5.94% from other races, and 1.56% from two or more races. 10.62% of the population were Hispanic or Latino of any race. 25.1% were of English, 15.1% German and 14.8% American ancestry according to Census 2000. Those citing " American" ancestry in Fremont County are of overwhelmingly English extraction, however most English Americans identify simply as having American ancestry because their roots have been in North America for so long, in some cases since the 1600s.     
There were 3,885 households out of which 39.50% had children under the age of 18 living with them, 67.90% were married couples living together, 6.90% had a female householder with no husband present, and 22.00% were non-families. 19.50% of all households were made up of individuals and 8.50% had someone living alone who was 65 years of age or older. The average household size was 2.96 and the average family size was 3.43.
In the county, the population was spread out with 33.10% under the age of 18, 9.30% from 18 to 24, 24.70% from 25 to 44, 20.40% from 45 to 64, and 12.40% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 105.80 males. For every 100 females age 18 and over, there were 105.80 males.
The median income for a household in the county was $33,424, and the median income for a family was $36,715. Males had a median income of $26,490 versus $19,670 for females. The per capita income for the county was $13,965. About 10.30% of families and 14.20% of the population were below the poverty line, including 18.40% of those under age 18 and 13.60% of those age 65 or over.
As of the 2010 United States Census, there were 13,242 people, 4,436 households, and 3,436 families residing in the county.  The population density was 7.1 inhabitants per square mile (2.7/km2). There were 8,531 housing units at an average density of 4.6 per square mile (1.8/km2).  The racial makeup of the county was 89.5% white, 0.7% American Indian, 0.3% black or African American, 0.2% Asian, 0.1% Pacific islander, 7.6% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 12.8% of the population.  In terms of ancestry, 29.9% were English, 22.7% were German, 7.6% were Irish, 6.1% were American, 5.7% were Scottish, and 5.1% were Danish. 
Of the 4,436 households, 38.7% had children under the age of 18 living with them, 65.9% were married couples living together, 7.2% had a female householder with no husband present, 22.5% were non-families, and 19.7% of all households were made up of individuals. The average household size was 2.88 and the average family size was 3.32. The median age was 33.5 years. 
The median income for a household in the county was $42,523 and the median income for a family was $52,510. Males had a median income of $35,907 versus $24,450 for females. The per capita income for the county was $18,616. About 6.8% of families and 8.5% of the population were below the poverty line, including 9.3% of those under age 18 and 9.7% of those age 65 or over. 
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