Atomic City is a city in Bingham County, Idaho, United States. The population was 41 at the 2020 census, up from 29 in 2010. History Atomic City was called "Midway" until 1950, as it is halfway between the towns of Blackfoot and Arco (home of Experimental Breeder Reactor I, the world's first electricity-generating nuclear power plant). Atomic City had a larger population when the neighboring Idaho National Laboratory site was newer, known as the "National Reactor Testing Station" until 1975. There is one store and one bar in Atomic City; the store no longer sells gasoline, due to new laws pertaining to its underground gas tanks. Most of the people who were raised in the town are now deceased, and many of the current residents are retired. There is an RV park on the south end of town with full hook-ups, and stock car races are held in the summer. Geography According to the United States Census Bureau, the city has a total area of , all of it land. Atomic City is just south of the Idaho National Laboratory site, on U.S. Route 26. Climate According to the Köppen Climate Classification system, Atomic City has a semi-arid climate, abbreviated "BSk" on climate maps. Demographics 2010 census At the 2010 census there were 29 people in 17 households, including 9 families, in the city. The population density was . There were 48 housing units at an average density of . The racial makeup of the city was 96.6% White and 3.4% Native American. Hispanic or Latino of any race were 3.4%. Of the 17 households 52.9% were married couples living together and 47.1% were non-families. 35.3% of households were made up of individuals. The average household size was 1.71 and the average family size was 2.11. The median age was 59.8 years. 0.0% of residents were under the age of 18; 0.0% were between the ages of 18 and 24; 6.9% were from 25 to 44; 58.6% were from 45 to 64; and 34.5% were 65 or older. The gender makeup of the city was 48.3% male and 51.7% female. 2000 census As of the census of 2000, there were 25 people in 16 households, including 7 families, in the city. The population density was . There were 22 housing units at an average density of . 24 of the residents were White, and one was Asian. Of the 16