Shelby is a city in and the county seat of Toole County, Montana, United States. The population was 3,376 at the 2010 census.
Shelby is located at 48°30′26″N 111°51′37″W / 48.50722°N 111.86028°W / 48.50722; -111.86028 (48.507270, -111.860218).
According to the United States Census Bureau, the city has a total area of 6.18 square miles (16.01 km), of which, 6.03 square miles (15.62 km) is land and 0.15 square miles (0.39 km) is water.
As of the census of 2010, there were 3,376 people, 1,245 households, and 717 families residing in the city. The population density was 559.9 inhabitants per square mile (216.2/km). There were 1,371 housing units at an average density of 227.4 per square mile (87.8/km). The racial makeup of the city was 89.5% White, 0.8% African American, 6.5% Native American, 0.5% Asian, 0.8% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 3.0% of the population.
There were 1,245 households of which 28.3% had children under the age of 18 living with them, 43.8% were married couples living together, 9.2% had a female householder with no husband present, 4.7% had a male householder with no wife present, and 42.4% were non-families. 37.4% of all households were made up of individuals and 14% had someone living alone who was 65 years of age or older. The average household size was 2.17 and the average family size was 2.84.
The median age in the city was 40.3 years. 18.9% of residents were under the age of 18; 8.3% were between the ages of 18 and 24; 29.3% were from 25 to 44; 29.9% were from 45 to 64; and 13.6% were 65 years of age or older. The gender makeup of the city was 58.3% male and 41.7% female.
As of the census of 2000, there were 3,216 people in the City of Shelby. The total number of households was 1,196, and the total number of families in the city was 735. The population density was 1,018.8 people per square mile (392.9/km²). There were 1,349 housing units at an average density of 427.3 per square mile (164.8/km²). The racial makeup of the city was 92.48% White, 0.25% African American, 4.17% Native American, 0.40% Asian, 0.25% from other races, and 2.46% from two or more races. Hispanic or Latino of any race were 1.24% of the population.
There were 1,196 households out of which 30.9% had children under the age of 18 living with them, 50.8% were married couples living together, 7.5% had a female householder with no husband present, and 38.5% were non-families. 35.5% of all households were made up of individuals and 16.1% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 3.07.
In the city, the population was spread out with 24.0% under the age of 18, 7.2% from 18 to 24, 29.5% from 25 to 44, 22.9% from 45 to 64, and 16.4% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 107.4 males. For every 100 females age 18 and over, there were 108.9 males.
The median income for a household in the city was $29,219, and the median income for a family was $41,046. Males had a median income of $27,634 versus $19,444 for females. The per capita income for the city was $15,071. About 6.1% of families and 8.6% of the population were below the poverty line, including 8.8% of those under age 18 and 7.5% of those age 65 or over.