Population 668 · Census ACS 2020–24
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Population and households in Jefferson Island
Household size in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 2.09 | 2.41 | 2.68 |
| 2010–14 | 2.20 | 2.45 | 2.73 |
| 2015–19 | 3.02 | 2.44 | 2.71 |
| 2020–24 | 2.32 | 2.44 | 2.65 |
| Change | +0.23 | +0.03 | −0.03 |
Households in Jefferson Island are small: just 2.32 people on average, compared with 2.65 nationally. That is typical of places where many people live alone or as couples, and fewer have children at home. Household size has climbed from 2.09 in 2006–10, but in a place this small, much of that may be survey noise rather than real change.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 49.7 | 39.9 | 37.7 |
| 2010–14 | 49.7 | 40.8 | 38.6 |
| 2015–19 | 45.5 | 41.5 | 39.6 |
| 2020–24 | 54.1 | 41.5 | 40.1 |
| Change | +4.3 | +1.6 | +2.3 |
With a median age of 54.1, Jefferson Island is noticeably older than the country as a whole (40.1), an age mix that tilts toward empty nesters and retirees.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 3.8% | 9.4% | 12.3% |
| 2010–14 | 11.6% | 9.8% | 12.3% |
| 2015–19 | 6.6% | 8.7% | 11.6% |
| 2020–24 | 6.6% | 8.8% | 11.6% |
| Change | +2.8 pts | −0.6 pts | −0.6 pts |
Single-parent households are relatively rare in Jefferson Island: 6.6% of households, against 11.6% nationally.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Jefferson Island
Renters in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 23.8% | 31.0% | 33.3% |
| 2010–14 | 22.0% | 32.3% | 35.6% |
| 2015–19 | 17.9% | 31.9% | 36.0% |
| 2020–24 | 25.2% | 30.8% | 34.8% |
| Change | +1.4 pts | −0.1 pts | +1.5 pts |
Most households in Jefferson Island own their homes; 25.2% rent, below the national share of 34.8%. Among homeowners, 53.4% have no mortgage at all, well above the national share of 39.8%.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 14.5% | 13.2% | 11.4% |
| 2010–14 | 18.6% | 13.9% | 11.4% |
| 2015–19 | 15.9% | 14.1% | 11.1% |
| 2020–24 | 18.2% | 12.2% | 9.6% |
| Change | +3.7 pts | −0.9 pts | −1.8 pts |
Vacant homes make up 18.2% of the housing in Jefferson Island, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 1975 | 1974 | 1974 |
| 2010–14 | 1982 | 1977 | 1975 |
| 2015–19 | 1985 | 1978 | 1977 |
| 2020–24 | 1981 | 1982 | 1980 |
| Change | +6 | +7 | +6 |
Homes in Jefferson Island are about the same age as the nation's housing: the median home was built in 1981, versus 1980 nationally.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | $754 | $703 | $965 |
| 2010–14 | $646 | $775 | $1,040 |
| 2015–19 | $765 | $870 | $1,213 |
| 2020–24 | $1,117 | $1,189 | $1,571 |
| Change | +$363 | +$487 | +$606 |
A typical rental in Jefferson Island costs $1,117 a month with utilities, well below the national median of $1,571. Rent takes 27.3% of the typical renter's income, just under the 30% mark often used to define affordable rent.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Jefferson Island
Bachelor's degrees in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 25.4% | 28.7% | 28.4% |
| 2010–14 | 25.6% | 29.8% | 29.6% |
| 2015–19 | 35.6% | 32.2% | 32.1% |
| 2020–24 | 21.5% | 35.3% | 35.6% |
| Change | −3.9 pts | +6.6 pts | +7.2 pts |
College degrees are relatively uncommon in Jefferson Island: 21.5% of adults 25 and older hold a bachelor's or higher, well below the national share of 35.6%.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 88.6% | 91.2% | 84.9% |
| 2010–14 | 93.6% | 92.6% | 86.1% |
| 2015–19 | 95.0% | 93.6% | 87.7% |
| 2020–24 | 91.2% | 94.6% | 89.3% |
| Change | +2.7 pts | +3.4 pts | +4.3 pts |
About nine in ten adults in Jefferson Island have finished high school (91.2%), a bit above the national rate of 89.3%. Still, the rate is lower than in Montana as a whole (94.6%).
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Jefferson Island
| Period | Jefferson Island | Montana | U.S. |
|---|---|---|---|
| 2006–10 | 3.3% | 5.7% | 8.1% |
| 2010–14 | 3.5% | 6.9% | 9.4% |
| 2015–19 | 4.4% | 4.2% | 5.6% |
| 2020–24 | 4.3% | 3.7% | 5.4% |
| Change | +1.1 pts | −2.0 pts | −2.7 pts |
Unemployment in Jefferson Island runs below the national rate: 4.3% of the labor force was out of work and looking, against 5.4% nationally. The picture is much the same across Montana. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Jefferson Island compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Jefferson Island | 2.32 | 54.1 | 6.6% | 25.2% | 18.2% | 1981 | $1,117 | 21.5% | 91.2% | 4.3% |
| Whitehall | 2.21 | 55.0 | 11.0% | 24.7% | 10.0% | 1982 | $975 | 17.9% | 90.6% | 6.9% |
| Cardwell | 2.32 | 54.8 | 3.4% | 22.4% | 23.6% | 1982 | $1,076 | 20.0% | 90.9% | 3.6% |
| Summit Valley | 2.57 | 54.3 | 1.9% | 12.4% | 39.2% | 1988 | $1,187 | 20.8% | 94.0% | 0.3% |
| Columbia Gardens | 2.11 | 61.6 | 2.3% | 16.7% | 10.8% | 1990 | $974 | 15.9% | 90.7% | 6.9% |
| Pony | 2.58 | 54.4 | 1.3% | 11.9% | 40.8% | 1988 | $1,182 | 20.4% | 93.9% | 0.3% |
| Harrison | 2.58 | 54.4 | 1.3% | 11.9% | 40.8% | 1988 | $1,182 | 20.4% | 93.9% | 0.3% |
| Silver Star | 2.57 | 55.1 | 5.5% | 25.3% | 16.6% | 1993 | $1,486 | 31.5% | 96.6% | 2.1% |
| Willow Creek | 2.43 | 50.7 | 14.3% | 15.1% | 14.8% | 1990 | $1,084 | 24.9% | 96.7% | 0.8% |
| Floral Park | 2.79 | 43.6 | 3.5% | 9.7% | 14.5% | 1985 | $937 | 40.9% | 98.3% | 2.8% |
| Butte-Silver Bow | 2.38 | 48.4 | 6.6% | 17.6% | 13.6% | 1990 | $966 | 28.4% | 94.6% | 1.4% |
All figures 2020–24.
Cities with similar populations: Cedar City, MO · Bowdle, SD · Bowmore, NC · Bowne Center, MI · Bradley, AR · Bremo Bluff, VA · Broom Hill, IN · Timberlake, OH · Bumpus Mills, TN · Villa Cavazos, TX
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Jefferson Island. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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