Prophetstown is a city in Whiteside County, Illinois, United States. The population was 2,080 at the 2010 census, up from 2,023 in 2000.
Prophetstown is located at 41°40′14″N 89°56′9″W / 41.67056°N 89.93583°W / 41.67056; -89.93583 (41.670504, -89.935869).
According to the 2010 census, Prophetstown has a total area of 1.394 square miles (3.61 km), of which 1.37 square miles (3.55 km) (or 98.28%) is land and 0.024 square miles (0.06 km) (or 1.72%) is water.
As of the census of 2000, there were 2,023 people, 809 households, and 533 families residing in the city. The population density was 1,484.5 people per square mile (574.3/km²). There were 865 housing units at an average density of 634.7 per square mile (245.6/km²). The racial makeup of the city was 97.92% White, 0.89% African American, 0.10% Native American, 0.10% Asian, 0.25% from other races, and 0.74% from two or more races. Hispanic or Latino of any race were 1.14% of the population.
There were 809 households out of which 25.5% had children under the age of 18 living with them, 56.1% were married couples living together, 7.4% had a female householder with no husband present, and 34.0% were non-families. 31.6% of all households were made up of individuals and 17.8% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.89.
In the city, the population was spread out with 21.4% under the age of 18, 7.2% from 18 to 24, 25.2% from 25 to 44, 23.3% from 45 to 64, and 23.0% who were 65 years of age or older. The median age was 43 years. For every 100 females, there were 93.4 males. For every 100 females age 18 and over, there were 88.3 males.
The median income for a household in the city was $37,452, and the median income for a family was $47,589. Males had a median income of $33,828 versus $21,438 for females. The per capita income for the city was $19,572. About 3.9% of families and 9.5% of the population were below the poverty line, including 8.4% of those under age 18 and 4.0% of those age 65 or over.