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3 Cities and towns
According to the U.S. Census Bureau, the county has a total area of 4,923 km² (1,901 mi²). 4,839 km² (1,868 mi²) of it is land and 83 km² (32 mi²) of it is water. The total area is 1.69% water.
Demographics\nAs of the census2 of 2000, there are 82,522 people, 28,753 households, and 21,449 families residing in the county. The population density is 17/km² (44/mi²). There are 30,484 housing units at an average density of 6/km² (16/mi²). The racial makeup of the county is 92.79% White, 0.49% Black or African American, 0.65% Native American, 0.82% Asian, 0.07% Pacific Islander, 3.72% from other races, and 1.46% from two or more races. 6.91% of the population are Hispanic or Latino of any race.
There are 28,753 households out of which 40.60% have children under the age of 18 living with them, 62.00% are married couples living together, 9.30% have a female householder with no husband present, and 25.40% are non-families. 21.40% of all households are made up of individuals and 7.80% have someone living alone who is 65 years of age or older. The average household size is 2.83 and the average family size is 3.33.
In the county the population is spread out with 32.10% under the age of 18, 9.50% from 18 to 24, 27.20% from 25 to 44, 21.00% from 45 to 64, and 10.20% who are 65 years of age or older. The median age is 32 years. For every 100 females there are 99.40 males. For every 100 females age 18 and over, there are 96.20 males.
The median income for a household in the county is $41,805, and the median income for a family is $48,216. Males have a median income of $38,745 versus $22,514 for females. The per capita income for the county is $18,326. 10.10% of the population and 7.40% of families are below the poverty line. Out of the total people living in poverty, 12.20% are under the age of 18 and 5.90% are 65 or older.
Cities and towns\n*Ammon\n*Idaho Falls\n*Iona\n*Irwin\n*Ririe\n*Swan Valley\n*Ucon