St. Anthony is a city in and the county seat of Fremont County, Idaho, United States. The population was 3,542 at the 2010 census, up from 3,342 in 2000. It is part of the Rexburg, Idaho Micropolitan Statistical Area.
According to the United States Census Bureau, the city has a total area of 1.55 square miles (4.01 km²), of which, 1.53 square miles (3.96 km²) is land and 0.02 square miles (0.05 km²) is water. St. Anthony is located along the Henrys Fork of the Snake River and on US Highway 20 about 10 miles northeast of Rexburg. The city is situated about 70 miles from the west entrance to Yellowstone National Park.
As of the census of 2010, there were 3,542 people, 1,118 households, and 857 families residing in the city. The population density was 2,315.0 inhabitants per square mile (893.8/km²). There were 1,252 housing units at an average density of 818.3 per square mile (315.9/km²). The racial makeup of the city was 85.9% White, 0.5% African American, 0.8% Native American, 0.5% Asian, 0.2% Pacific Islander, 10.6% from other races, and 1.6% from two or more races. Hispanic or Latino of any race were 20.9% of the population.
There were 1,118 households of which 45.3% had children under the age of 18 living with them, 58.8% were married couples living together, 12.1% had a female householder with no husband present, 5.8% had a male householder with no wife present, and 23.3% were non-families. 20.3% of all households were made up of individuals and 7.7% had someone living alone who was 65 years of age or older. The average household size was 2.94 and the average family size was 3.39.
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