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Jefferson County is a county in Montana, United States. As of the 2020 census, the population was 12,085.[2] Its county seat is Boulder.[3] The county was created in 1865[4] and named for President Thomas Jefferson.[5]
Jefferson County | |
|---|---|
_-_Jefferson_County,_Montana.png) Jefferson County Courthouse in Boulder | |
 Location within the U.S. state of Montana | |
 Montana's location within the U.S. | |
| Coordinates: 46.18°N 112.11°W | |
| Country |  United States |
| State |  Montana |
| Founded | February 2, 1865[1] |
| Named for | Thomas Jefferson |
| Seat | Boulder |
| Largest town | Clancy |
| Area | |
• Total | 1,659 sq mi (4,300 km2) |
| • Land | 1,656 sq mi (4,290 km2) |
| • Water | 2.6 sq mi (7 km2) 0.2% |
| Population (2020) | |
• Total | 12,085 |
• Estimate (2022) | 12,826  |
| • Density | 7/sq mi (3/km2) |
| Time zone | UTC−7 (Mountain) |
| • Summer (DST) | UTC−6 (MDT) |
| Congressional district | 2nd |
| Website | www |
| |
Jefferson County is part of the Helena, MT Micropolitan Statistical Area.
According to the United States Census Bureau, the county has a total area of 1,659 square miles (4,300 km2), of which 1,656 square miles (4,290 km2) is land and 2.6 square miles (6.7 km2) (0.2%) is water.[6]
Major highways
Adjacent counties
- Lewis and Clark County - north
- Broadwater County - east
- Gallatin County - southeast
- Madison County - south
- Silver Bow County - west
- Deer Lodge County - west
- Powell County - northwest
National protected areas
- Deerlodge National Forest (part)
- Helena National Forest (part)
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| Year | Republican | Democratic | Third party(ies) | |||
|---|---|---|---|---|---|---|
| No. | % | No. | % | No. | % | |
| 2024 | 5,544 | 66.85% | 2,516 | 30.34% | 233 | 2.81% |
| 2020 | 5,345 | 65.57% | 2,625 | 32.20% | 181 | 2.22% |
| 2016 | 4,177 | 62.21% | 1,998 | 29.76% | 539 | 8.03% |
| 2012 | 4,055 | 62.18% | 2,272 | 34.84% | 194 | 2.98% |
| 2008 | 3,538 | 55.80% | 2,582 | 40.72% | 221 | 3.49% |
| 2004 | 3,844 | 65.51% | 1,881 | 32.06% | 143 | 2.44% |
| 2000 | 3,308 | 64.07% | 1,513 | 29.30% | 342 | 6.62% |
| 1996 | 2,248 | 46.82% | 1,775 | 36.97% | 778 | 16.20% |
| 1992 | 1,541 | 36.47% | 1,415 | 33.49% | 1,269 | 30.04% |
| 1988 | 2,007 | 52.31% | 1,746 | 45.50% | 84 | 2.19% |
| 1984 | 2,226 | 61.53% | 1,324 | 36.59% | 68 | 1.88% |
| 1980 | 1,841 | 57.12% | 1,055 | 32.73% | 327 | 10.15% |
| 1976 | 1,387 | 52.26% | 1,210 | 45.59% | 57 | 2.15% |
| 1972 | 1,281 | 56.06% | 904 | 39.56% | 100 | 4.38% |
| 1968 | 798 | 45.06% | 820 | 46.30% | 153 | 8.64% |
| 1964 | 662 | 40.59% | 967 | 59.29% | 2 | 0.12% |
| 1960 | 817 | 51.38% | 769 | 48.36% | 4 | 0.25% |
| 1956 | 1,049 | 61.38% | 660 | 38.62% | 0 | 0.00% |
| 1952 | 1,084 | 60.76% | 687 | 38.51% | 13 | 0.73% |
| 1948 | 750 | 45.62% | 836 | 50.85% | 58 | 3.53% |
| 1944 | 797 | 49.72% | 803 | 50.09% | 3 | 0.19% |
| 1940 | 830 | 39.58% | 1,259 | 60.04% | 8 | 0.38% |
| 1936 | 573 | 27.78% | 1,409 | 68.30% | 81 | 3.93% |
| 1932 | 784 | 37.09% | 1,246 | 58.94% | 84 | 3.97% |
| 1928 | 1,013 | 56.97% | 751 | 42.24% | 14 | 0.79% |
| 1924 | 648 | 36.49% | 434 | 24.44% | 694 | 39.08% |
| 1920 | 969 | 54.47% | 688 | 38.67% | 122 | 6.86% |
| 1916 | 712 | 36.63% | 1,124 | 57.82% | 108 | 5.56% |
| 1912 | 239 | 20.03% | 479 | 40.15% | 475 | 39.82% |
| 1908 | 546 | 39.22% | 714 | 51.29% | 132 | 9.48% |
| 1904 | 663 | 45.54% | 580 | 39.84% | 213 | 14.63% |
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| Census | Pop. | Note | %± |
|---|---|---|---|
| 1870 | 1,531 | — | |
| 1880 | 2,464 | 60.9% | |
| 1890 | 6,026 | 144.6% | |
| 1900 | 5,330 | −11.5% | |
| 1910 | 5,601 | 5.1% | |
| 1920 | 5,203 | −7.1% | |
| 1930 | 4,133 | −20.6% | |
| 1940 | 4,664 | 12.8% | |
| 1950 | 4,014 | −13.9% | |
| 1960 | 4,297 | 7.1% | |
| 1970 | 5,238 | 21.9% | |
| 1980 | 7,029 | 34.2% | |
| 1990 | 7,939 | 12.9% | |
| 2000 | 10,049 | 26.6% | |
| 2010 | 11,406 | 13.5% | |
| 2020 | 12,085 | 6.0% | |
| 2022 (est.) | 12,826 | [8] | 6.1% |
| U.S. Decennial Census[9] 1790–1960,[10] 1900–1990,[11] 1990–2000,[12] 2010–2020[2] | |||
2020 census
As of the 2020 census, there were 12,085 people living in the county.[13]
2010 census
As of the 2010 census, there were 11,406 people, 4,512 households, and 3,301 families residing in the county. The population density was 6.9 inhabitants per square mile (2.7/km2). There were 5,055 housing units at an average density of 3.1 per square mile (1.2/km2). The racial makeup of the county was 95.5% white, 1.4% American Indian, 0.4% Asian, 0.1% black or African American, 0.4% from other races, and 2.2% from two or more races. Those of Hispanic or Latino origin made up 2.0% of the population. In terms of ancestry, 31.3% were German, 19.1% were Irish, 17.2% were English, 10.8% were Norwegian, and 4.2% were American.
Of the 4,512 households, 28.8% had children under the age of 18 living with them, 63.7% were married couples living together, 5.4% had a female householder with no husband present, 26.8% were non-families, and 22.6% of all households were made up of individuals. The average household size was 2.48 and the average family size was 2.90. The median age was 46.2 years.
The median income for a household in the county was $56,695 and the median income for a family was $67,195. Males had a median income of $50,978 versus $34,148 for females. The per capita income for the county was $26,437. About 2.7% of families and 12.8% of the population were below the poverty line, including 5.1% of those under age 18 and 8.6% of those age 65 or over.
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Towns
Census-designated places
Unincorporated communities
Former communities
Whitehall Public Schools has two components: Whitehall Elementary School District and Whitehall High School District.[26]
High school districts include Jefferson High School District and Whitehall High School District.[27]
Elementary school districts include:[27]
- Basin Elementary School District
- Boulder Elementary School District
- Cardwell Elementary School District
- Clancy Elementary School District
- Montana City Elementary School District
- Three Forks Elementary School District
- Whitehall Elementary School District
- Willow Creek Elementary School District
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