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Boulder is a town in and the county seat of Jefferson County, Montana. It is located at the junction of Interstate 15 and Montana Highway 69. It is part of the Helena Micropolitan Statistical Area, and its population at the 2000 census was 1,300.
After establishment, the town became a regional trading center for farmers, ranchers, and miners and, by the end of the twentieth century, home to state schools for the deaf, blind and developmentally disabled.
Currently, many people are employed in Boulder at the Montana Developmental Center, a state institution for people with developmental disabilities. Some work for Alternative Youth Adventures, which provides services for troubled youth. In addition, Riverside Corrections, a state-run detention center for juvenile females, employs about 30 people. Boulder is also popular for its "health mines" (which are controversial in nature).
The town has a large community library, two weekly newspapers and a local radio station. Three buildings in Boulder are on the National Register of Historic Places.
The population predominantly comprises White Americans. A small percentage of the population comprises people of Hispanic origin, as well as Native Americans.
| Label | Estimate | Margin of Error | Percent | Percent Margin of Error |
 SEX AND AGE |
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| Total population |
1,033 | ±227 | 1,033% | (x) |
| Male | 526 | ±142 | 51% | ±9 |
| Female | 507 | ±145 | 49% | ±9 |
| Sex ratio (males per 100 females) | 104 | ±36 | (x) | (x) |
| Under 5 years | 101 | ±58 | 10% | ±5 |
| 5 to 9 years | 103 | ±54 | 10% | ±4 |
| 10 to 14 years | 28 | ±23 | 3% | ±2 |
| 15 to 19 years | 54 | ±44 | 5% | ±4 |
| 20 to 24 years | 85 | ±53 | 8% | ±5 |
| 25 to 34 years | 104 | ±51 | 10% | ±5 |
| 35 to 44 years | 160 | ±90 | 16% | ±8 |
| 45 to 54 years | 112 | ±58 | 11% | ±6 |
| 55 to 59 years | 70 | ±64 | 7% | ±6 |
| 60 to 64 years | 74 | ±35 | 7% | ±4 |
| 65 to 74 years | 76 | ±39 | 7% | ±4 |
| 75 to 84 years | 47 | ±41 | 5% | ±4 |
| 85 years and over | 19 | ±30 | 2% | ±3 |
| Median age (years) | 40 | ±10 | (x) | (x) |
| Under 18 years | 249 | ±109 | 24% | ±8 |
| 16 years and over | 801 | ±172 | 78% | ±8 |
| 18 years and over | 784 | ±165 | 76% | ±8 |
| 21 years and over | 747 | ±160 | 72% | ±8 |
| 62 years and over | 187 | ±67 | 18% | ±6 |
| 65 years and over | 142 | ±56 | 14% | ±5 |
| 18 years and over |
784 | ±165 | 784 | (x) |
| Male | 471 | ±125 | 60% | ±8 |
| Female | 313 | ±81 | 40% | ±8 |
| Sex ratio (males per 100 females) | 151 | ±49 | (x) | (x) |
| 65 years and over |
142 | ±56 | 142 | (x) |
| Male | 67 | ±36 | 47% | ±20 |
| Female | 75 | ±43 | 53% | ±20 |
| Sex ratio (males per 100 females) | 89 | ±73 | (x) | (x) |
| RACE |
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| Total population |
1,033 | ±227 | 1,033% | (x) |
| One race | 1,004 | ±224 | 97% | ±3 |
| Two or more races | 29 | ±31 | 3% | ±3 |
| One race |
1,004 | ±224 | 97% | ±3 |
| White | 949 | ±204 | 92% | ±5 |
| Black or African American | 0 | ±11 | 0% | ±3 |
| American Indian and Alaska Native |
55 | ±62 | 5% | ±6 |
| Cherokee tribal grouping | 11 | ±22 | 1% | ±2 |
| Chippewa tribal grouping | 0 | ±11 | 0% | ±3 |
| Navajo tribal grouping | 0 | ±11 | 0% | ±3 |
| Sioux tribal grouping | 0 | ±11 | 0% | ±3 |
| Asian |
0 | ±11 | 0% | ±3 |
| Asian Indian | 0 | ±11 | 0% | ±3 |
| Chinese | 0 | ±11 | 0% | ±3 |
| Filipino | 0 | ±11 | 0% | ±3 |
| Japanese | 0 | ±11 | 0% | ±3 |
| Korean | 0 | ±11 | 0% | ±3 |
| Vietnamese | 0 | ±11 | 0% | ±3 |
| Other Asian | 0 | ±11 | 0% | ±3 |
| Native Hawaiian and Other Pacific Islander |
0 | ±11 | 0% | ±3 |
| Native Hawaiian | 0 | ±11 | 0% | ±3 |
| Chamorro | 0 | ±11 | 0% | ±3 |
| Samoan | 0 | ±11 | 0% | ±3 |
| Other Pacific Islander | 0 | ±11 | 0% | ±3 |
| Some other race | 0 | ±11 | 0% | ±3 |
| Two or more races |
29 | ±31 | 3% | ±3 |
| White and Black or African American | 20 | ±30 | 2% | ±3 |
| White and American Indian and Alaska Native | 9 | ±11 | 1% | ±1 |
| White and Asian | 0 | ±11 | 0% | ±3 |
| Black or African American and American Indian and Alaska Native | 0 | ±11 | 0% | ±3 |
| Race alone or in combination with one or more other races |
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| Total population |
1,033 | ±227 | 1,033% | (x) |
| White | 978 | ±211 | 95% | ±6 |
| Black or African American | 20 | ±30 | 2% | ±3 |
| American Indian and Alaska Native | 64 | ±58 | 6% | ±5 |
| Asian | 0 | ±11 | 0% | ±3 |
| Native Hawaiian and Other Pacific Islander | 0 | ±11 | 0% | ±3 |
| Some other race | 0 | ±11 | 0% | ±3 |
| HISPANIC OR LATINO AND RACE |
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| Total population |
1,033 | ±227 | 1,033% | (x) |
| Hispanic or Latino (of any race) |
29 | ±33 | 3% | ±3 |
| Mexican | 22 | ±32 | 2% | ±3 |
| Puerto Rican | 0 | ±11 | 0% | ±3 |
| Cuban | 0 | ±11 | 0% | ±3 |
| Other Hispanic or Latino | 7 | ±10 | 1% | ±1 |
| Not Hispanic or Latino |
1,004 | ±234 | 97% | ±3 |
| White alone | 920 | ±210 | 89% | ±5 |
| Black or African American alone | 0 | ±11 | 0% | ±3 |
| American Indian and Alaska Native alone | 55 | ±62 | 5% | ±6 |
| Asian alone | 0 | ±11 | 0% | ±3 |
| Native Hawaiian and Other Pacific Islander alone | 0 | ±11 | 0% | ±3 |
| Some other race alone | 0 | ±11 | 0% | ±3 |
| Two or more races |
29 | ±31 | 3% | ±3 |
| Two races including Some other race | 0 | ±11 | 0% | ±3 |
| Two races excluding Some other race, and Three or more races | 29 | ±31 | 3% | ±3 |
| Total housing units | 450 | ±88 | (x) | (x) |
| CITIZEN, VOTING AGE POPULATION |
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| Citizen, 18 and over population |
784 | ±165 | 784 | (x) |
| Male | 471 | ±125 | 60% | ±8 |
| Female | 313 | ±81 | 40% | ±8 |
