Irwin is a city in Bonneville County, Idaho, United States. It is part of the Idaho Falls, Idaho Metropolitan Statistical Area. The population was 219 at the 2010 census. Geography Irwin is located at (43.388220, -111.268118). According to the United States Census Bureau, the city has a total area of , all of it land. Demographics 2010 census As of the census of 2010, there were 219 people, 103 households, and 70 families residing in the city. The population density was . There were 166 housing units at an average density of . The racial makeup of the city was 99.1% White, 0.5% Asian, and 0.5% from two or more races. Hispanic or Latino of any race were 0.5% of the population. There were 103 households, of which 15.5% had children under the age of 18 living with them, 62.1% were married couples living together, 4.9% had a female householder with no husband present, 1.0% had a male householder with no wife present, and 32.0% were non-families. 25.2% of all households were made up of individuals, and 9.7% had someone living alone who was 65 years of age or older. The average household size was 2.13 and the average family size was 2.53. The median age in the city was 52.4 years. 11.9% of residents were under the age of 18; 5.1% were between the ages of 18 and 24; 21% were from 25 to 44; 38.4% were from 45 to 64; and 23.7% were 65 years of age or older. The gender makeup of the city was 51.6% male and 48.4% female. 2000 census As of the census of 2000, there were 157 people, 71 households, and 47 families residing in the city. The population density was . There were 125 housing units at an average density of . The racial makeup of the city was 98.09% White, 0.64% Asian, 1.27% from other races. Hispanic or Latino of any race were 1.91% of the population. There were 71 households, out of which 22.5% had children under the age of 18 living with them, 60.6% were married couples living together, 2.8% had a female householder with no husband present, and 32.4% were non-families. 31.0% of all households were made up of individuals, and 15.5% had someone living alone who was 65 years of age or older. The average household size was 2.21 and the average family size was 2.73. In