Shell Rock is a city in Butler County, Iowa, United States, along the Shell Rock River. The population was 1,268 at the time of the 2020 census. The city is located along the county's eastern border, between Butler and Bremer counties. Geography Shell Rock is located at (42.711033, -92.583471). According to the United States Census Bureau, the city has a total area of , of which is land and is water. Demographics 2010 census As of the census of 2010, there were 1,296 people, 554 households, and 363 families living in the city. The population density was . There were 588 housing units at an average density of . The racial makeup of the city was 97.5% White, 0.4% Native American, 0.2% Asian, 0.3% from other races, and 1.6% from two or more races. Hispanic or Latino of any race were 1.2% of the population. There were 554 households, of which 27.4% had children under the age of 18 living with them, 53.8% were married couples living together, 6.9% had a female householder with no husband present, 4.9% had a male householder with no wife present, and 34.5% were non-families. 30.9% of all households were made up of individuals, and 15.7% had someone living alone who was 65 years of age or older. The average household size was 2.26 and the average family size was 2.81. The median age in the city was 44.1 years. 21.3% of residents were under the age of 18; 6.6% were between the ages of 18 and 24; 23.4% were from 25 to 44; 29% were from 45 to 64; and 19.7% were 65 years of age or older. The gender makeup of the city was 49.0% male and 51.0% female. 2000 census As of the census of 2000, there were 1,298 people, 535 households, and 367 families living in the city. The population density was . There were 556 housing units at an average density of . The racial makeup of the city was 98.38% White, 0.15% African American, 0.39% Asian, 0.08% from other races, and 1.00% from two or more races. Hispanic or Latino of any race were 0.23% of the population. There were 535 households, out of which 29.7% had children under the age of 18 living with them, 59.1% were married couples living together, 7.3% had a female householder with no husband present, and 31.4% were non-families. 28.8% of all households