As of the census of 2010, there were 4,488 people, 1,991 households, and 1,150 families living in the city. The population density was. There were 2,506 housing units at an average density of. The racial makeup of the city was 74.7% White, 0.2% African American, 15.7% Native American, 0.8% Asian, 0.6% from other races, and 8.0% from two or more races. Hispanic or Latino of any race were 3.4% of the population. There were 1,991 households of which 29.1% had children under the age of 18 living with them, 38.6% were married couplesliving together, 13.9% had a female householder with no husband present, 5.3% had a male householder with no wife present, and 42.2% were non-families. 35.7% 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 2.21 and the average family size was 2.86. The median age in the city was 40 years. 24.2% of residents were under the age of 18; 9.1% were between the ages of 18 and 24; 22.4% were from 25 to 44; 24.5% were from 45 to 64; and 19.7% were 65 years of age or older. The gender makeup of the city was 46.9% male and 53.1% female.
2000 census
As of the census of 2000, there were 4,041 people, 1,739 households, and 1,052 families living in the city. The population density was 1,490.9 people per square mile. There were 1,977 housing units at an average density of 729.4 per square mile. The racial makeup of the city was 78.25% White, 0.15% African American, 16.11% Native American, 0.47% Asian, 0.07% Pacific Islander, 0.45% from other races, and 4.50% from two or more races. Hispanic or Latino of any race were 2.25% of the population. There were 1,739 households out of which 31.1% had children under the age of 18 living with them, 42.7% were married couples living together, 13.2% had a female householder with no husband present, and 39.5% were non-families. 34.0% of all households were made up of individuals and 16.7% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.86. In the city, the population was spread out with 25.6% under the age of 18, 8.7% from 18 to 24, 25.3% from 25 to 44, 20.9% from 45 to 64, and 19.6% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 86.8 males. For every 100 females age 18 and over, there were 83.8 males. The median income for a household in the city was $21,870, and the median income for a family was $30,833. Males had a median income of $21,113 versus $19,210 for females. The per capita income for the city was $13,777. About 16.0% of families and 19.8% of the population were below the poverty line, including 27.5% of those under age 18 and 12.2% of those age 65 or over.
Government
Polson uses a city commission consisting of six commissioners and the city mayor. As of February 2020, the current mayor of Polson is Paul Briney.
Climate
Polson has a continental climate. However, its proximity to Flathead Lake, the largest natural freshwater body of water in the western United States, moderates its weather, meaning its winters are less cold and its summers generally less hot than adjacent areas of the same continental type.
