[5] 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.

Mining, timber, and ranching operations commenced in the Island Park area prior to 1870.

At the 1890 Census, Bingham County enumerated 301 residents in the precincts of Teton and Henry's Lake.

[9][10] Additional settlement occurred at Warm River in 1896, the Drummond area in 1900, and Newdale in 1914.

[11][12] The Fremont County Courthouse in St. Anthony is on the National Register of Historic Places.

[14] The southern part of the county covers the northeastern tip of the Snake River Basin, with the mountains of the continental divide forming its northern boundary.

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.

As of the 2010 United States Census, there were 13,242 people, 4,436 households, and 3,436 families living in the county.

[27] 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.

[31][32] This rural healthcare system has several health clinics in the county with Madison Memorial as the nearest medical hospital with a trauma center for emergencies.

Fremont consistently ranks above average for air quality scores.

Lyndon B. Johnson in 1964 was the last Democratic presidential candidate to carry the county, and even then by only 25 votes.

To date, LBJ is the last Democrat to attain 40 percent of the county's vote, and no Democrat has won more than 30 percent of the county’s vote since Jimmy Carter in 1976.

In fact, third-party candidates outpolled the Democratic nominee in 1972, 1992 and 2016.