2020 census
As of the 2020 census, the county had a population of 35,133; 20.0% of residents were under the age of 18 and 20.6% were 65 years of age or older, and the median age was 41.8 years. For every 100 females there were 103.0 males, and for every 100 females age 18 and over there were 101.5 males. 86.1% of residents lived in urban areas and 13.9% lived in rural areas. [9] [10]
Silver Bow County, Montana – Racial composition
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.| Race (NH = Non-Hispanic) | % 2020 [11] | % 2010 [12] | % 2000 [13] | Pop 2020 | Pop 2010 | Pop 2000 |
|---|
| White alone (NH) | 88.5% | 92.1% | 93.7% | 31,081 | 31,515 | 32,410 |
| Black alone (NH) | 0.4% | 0.3% | 0.1% | 126 | 103 | 45 |
| American Indian alone (NH) | 1.4% | 1.7% | 1.8% | 480 | 587 | 619 |
| Asian alone (NH) | 0.6% | 0.5% | 0.4% | 214 | 161 | 147 |
| Pacific Islander alone (NH) | 0.1% | 0.1% | 0.1% | 20 | 22 | 20 |
| Other race alone (NH) | 0.4% | 0% | 0.1% | 134 | 13 | 18 |
| Multiracial (NH) | 4.1% | 1.6% | 1.1% | 1,440 | 546 | 397 |
| Hispanic/Latino (any race) | 4.7% | 3.7% | 2.7% | 1,638 | 1,253 | 950 |
The racial makeup of the county was 90.5% White, 0.4% Black or African American, 1.6% American Indian and Alaska Native, 0.6% Asian, 1.0% from some other race, and 5.9% from two or more races. Hispanic or Latino residents of any race comprised 4.7% of the population. [14]
There were 15,450 households in the county, of which 23.9% had children under the age of 18 living with them and 27.9% had a female householder with no spouse or partner present. About 36.4% of all households were made up of individuals and 15.6% had someone living alone who was 65 years of age or older. [10]
There were 17,247 housing units, of which 10.4% were vacant. Among occupied housing units, 65.7% were owner-occupied and 34.3% were renter-occupied. The homeowner vacancy rate was 1.7% and the rental vacancy rate was 11.2%. [10]
The most reported ancestries in 2020 were: [15]
2010 census
As of the 2010 census, there were 34,200 people, 14,932 households, and 8,651 families living in the county. The population density was 47.6 inhabitants per square mile (18.4/km2). There were 16,717 housing units at an average density of 23.3 per square mile (9.0/km2). The racial makeup of the county was 94.4% white, 1.9% American Indian, 0.5% Asian, 0.3% black or African American, 0.1% Pacific islander, 0.7% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 3.7% of the population. In terms of ancestry, 32.6% were Irish, 23.3% were German, 16.1% were English, 8.3% were Italian, 6.9% were Norwegian, and 3.2% were American.
Of the 14,932 households, 26.0% had children under the age of 18 living with them, 42.2% were married couples living together, 10.6% had a female householder with no husband present, 42.1% were non-families, and 35.1% of all households were made up of individuals. The average household size was 2.22 and the average family size was 2.87. The median age was 41.3 years.
The median income for a household in the county was $37,986 and the median income for a family was $52,288. Males had a median income of $41,491 versus $28,132 for females. The per capita income for the county was $21,357. About 11.6% of families and 17.8% of the population were below the poverty line, including 23.1% of those under age 18 and 8.9% of those age 65 or over.
United States
Montana 
