Idaho Falls is the largest city in the Eastern Idaho region. Idaho Falls is the principal city of, and is included in, the Idaho Falls, Idaho Metropolitan Statistical Area, which is included in the Idaho Falls-Blackfoot, Idaho Combined Statistical Area. Idaho Falls is the third-largest metropolitan area in the state behind the Boise City-Nampa and Coeur d'Alene metropolitan areas. It is the largest metropolitan area of the Eastern Idaho region. In the past decade, it has been surpassed in population by Meridian and Nampa, making Idaho Falls the fifth-largest city in Idaho. The city is served by the Idaho Falls Regional Airport and is home to the Idaho Falls Chukars minor league baseball team. Its sister city is the town of Tokai-Mura, Japan.
Idaho Falls borders on Ammon, Idaho and serves as a hub to several surrounding communities including Iona, Idaho.
The 2000 census reported there were 50,730 people, 18,793 households, and 13,173 families residing in the city, though MSN real estate reports an area population of 110,220. The population density was 2,972.2 people per square mile (1,147.4/km²). There were 19,771 housing units at an average density of 1,158.4/sq mi (447.2/km²). The racial makeup of the city was 92.09% White, 0.62% African American, 0.76% Native American, 1.05% Asian, 0.06% Pacific Islander, 3.81% from other races, and 1.61% from two or more races. Hispanic or Latino of any race were 7.18% of the population.
There were 18,793 households out of which 37.5% had children under the age of 18 living with them, 56.5% were married couples living together, 10.2% had a female householder with no husband present, and 29.9% were non-families. 25.3% of all households were made up of individuals and 9.1% had someone living alone who was 65 years of age or older. The average household size was 2.65 and the average family size was 3.21.
In the city the population was spread out with 30.3% under the age of 18, 10.1% from 18 to 24, 27.6% from 25 to 44, 20.9% from 45 to 64, and 11.1% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 97.9 males. For every 100 females age 18 and over, there were 94.8 males.
The median income for a household in the city was $40,512, and the median income for a family was $47,431. Males had a median income of $39,082 versus $23,001 for females. The per capita income for the city was $18,857. About 7.8% of families and 10.9% of the population were below the poverty line, including 12.7% of those under age 18 and 6.3% of those age 65 or over.
The top five ethnic groups in Idaho Falls are: