Shellsburg is a city in Benton County, Iowa, United States. The population was 961 at the time of the 2020 census. It is part of the Cedar Rapids Metropolitan Statistical Area. History Shellsburg was founded in 1854. Geography According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census At the 2010 census there were 983 people, 428 households, and 276 families living in the city. The population density was . There were 455 housing units at an average density of . The racial makup of the city was 96.7% White, 0.7% African American, 1.0% Native American, 0.1% Asian, 0.1% Pacific Islander, and 1.3% from two or more races. Hispanic or Latino of any race were 0.5%. Of the 428 households 27.8% had children under the age of 18 living with them, 51.9% were married couples living together, 8.9% had a female householder with no husband present, 3.7% had a male householder with no wife present, and 35.5% were non-families. 30.1% of households were one person and 15.4% were one person aged 65 or older. The average household size was 2.24 and the average family size was 2.74. The median age was 44.6 years. 20.9% of residents were under the age of 18; 6.2% were between the ages of 18 and 24; 23.5% were from 25 to 44; 30.1% were from 45 to 64; and 19.3% were 65 or older. The gender makeup of the city was 48.5% male and 51.5% female. 2000 census At the 2000 census there were 938 people, 356 households, and 260 families living in the city. The population density was . There were 370 housing units at an average density of . The racial makup of the city was 99.04% White, 0.32% Native American, 0.32% Asian, and 0.32% from two or more races. Hispanic or Latino of any race were 0.43%. Of the 356 households 36.5% had children under the age of 18 living with them, 63.5% were married couples living together, 5.6% had a female householder with no husband present, and 26.7% were non-families. 21.9% of households were one person and 8.4% were one person aged 65 or older. The average household size was 2.57 and the average family size was 3.00. The age distribution was 27.5% under the age of 18, 5.0% from 18 to 24, 33.6% from 25 to 44, 20.8% from 45