Laboratory (INL) is located east of Arco. Arco Peak, located two mile north of the community at an elevation of 7547 feet, rises 2220 feet above the city. According to the United States Census Bureau, the city has a total area of , of which, is land and is water. In town, the most striking physical feature is Number Hill, a rocky hill with numbers painted all over it. Butte County High School has a tradition of each class since 1920 painting its graduation year on the face of hill. Climate Demographics 2010 census As of the 2010 United States Census of 2010, there were 995 people, 417 households, and 254 families living in the city. The population density was . There were 504 housing units at an average density of . The racial makeup of the city was 95.1% White, 0.3% Native American, 0.3% Asian, 1.7% from other races, and 2.6% from two or more races. Hispanic or Latino of any race were 3.0% of the population. There were 417 households, of which 30.2% had children under the age of 18 living with them, 44.4% were married couples living together, 13.2% had a female householder with no husband present, 3.4% had a male householder with no wife present, and 39.1% were non-families. 34.1% of all households were made up of individuals, and 15.9% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 3.03. The median age in the city was 41.2 years. 26.9% of residents were under the age of 18; 6.1% were between the ages of 18 and 24; 21.6% were from 25 to 44; 26.1% were from 45 to 64; and 18.9% were 65 years of age or older. The gender makeup of the city was 51.8% male and 48.2% female. 2000 census As of the 2000 United States Census of 2000, there were 1,026 people, 427 households, and 269 families living in the city. The population density was . There were 505 housing units at an average density of . The racial makeup of the city was 95.13% White, 0.49% African American, 1.36% Native American, 1.75% from other races, and 1.27% from two or more races. Hispanic or Latino of any race were 3.61% of the population. There were 427 households, out of which 29.3% had children under the age of