As of the 2023
American Community Survey, there are 5,774 estimated households in Spearfish with an average of 2.04 persons per household. The city has a median household income of $59,731. Approximately 15.2% of the city's population lives at or below the
poverty line. Spearfish has an estimated 64.7% employment rate, with 43.6% of the population holding a bachelor's degree or higher and 95.9% holding a high school diploma. The top five reported ancestries (people were allowed to report up to two ancestries, thus the figures will generally add to more than 100%) were English (96.0%), Spanish (1.7%), Indo-European (0.9%), Asian and Pacific Islander (1.0%), and Other (0.3%). The median age in the city was 37.2 years. The median age was 36.7 years. 19.7% of residents were under the age of 18 and 22.2% of residents were 65 years of age or older. For every 100 females there were 90.1 males, and for every 100 females age 18 and over there were 86.6 males age 18 and over.
2010 census As of the
2010 census, there were 10,494 people, 4,644 households, and 2,350 families residing in the city. The population density was . There were 5,045 housing units at an average density of . The racial makeup of the city was 93.53%
White, 0.41%
African American, 2.05%
Native American, 1.11%
Asian, 0.02%
Pacific Islander, 0.59% from some other races and 2.30% from two or more races.
Hispanic or Latino people of any race were 2.73% of the population. There were 4,644 households, of which 23.1% had children under the age of 18 living with them, 38.5% were
married couples living together, 8.9% had a female householder with no husband present, 3.3% had a male householder with no wife present, and 49.4% were non-families. 39.3% of all households were made up of individuals, and 16.9% had someone living alone who was 65 years of age or older. The average household size was 2.09 and the average family size was 2.79. The median age in the city was 33.2 years. 18.6% of residents were under the age of 18; 20.2% were between the ages of 18 and 24; 22.3% were from 25 to 44; 21.2% were from 45 to 64; and 17.7% were 65 years of age or older. The gender makeup of the city was 47.1% male and 52.9% female.
2000 census As of the
2000 census, there were 8,606 people, 3,638 households, and 1,931 families residing in the city. The population density was . There were 3,904 housing units at an average density of . The racial makeup of the city was 95.33%
White, 0.35%
African American, 2.31%
Native American, 0.36%
Asian, 0.02%
Pacific Islander, 0.33% from some other races and 1.30% from two or more races.
Hispanic or Latino people of any race were 1.73% of the population. In terms of ancestry, 37.5% were of
German, 13.5%
Norwegian, 9.6%
English and 8.2%
Irish. There were 3,638 households, out of which 25.2% had children under the age of 18 living with them, 41.4% were
married couples living together, 9.2% had a female householder with no husband present, and 46.9% were non-families. 37.0% of all households were made up of individuals, and 15.5% had someone living alone who was 65 years of age or older. The average household size was 2.15 and the average family size was 2.85. In the city, the population was spread out, with 20.3% under the age of 18, 21.5% from 18 to 24, 23.3% from 25 to 44, 17.9% from 45 to 64, and 17.1% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 87.1 males. For every 100 females age 18 and over, there were 83.3 males. As of 2000 the median income for a household in the city was $26,887, and the median income for a family was $40,257. Males had a median income of $30,242 versus $20,431 for females. The
per capita income for the city was $16,565. About 9.8% of families and 17.4% of the population were below the
poverty line, including 16.1% of those under age 18 and 9.4% of those age 65 or over. ==Radio and TV stations==