Population 33,154 · Census ACS 2020–24
Choose a measure to map it.Tap a measure to map it. Swipe the row for more. Arrows show the change since 2006–10.
Median age by neighborhoodHistory and comparison ↓︎
Younger residents
Older residents
Colorblind friendly
off
More maps of Jefferson County: Best Neighborhoods · Walk Grade · Household income · Home prices · Race · Politics · Traffic noise · Internet
Population and households in Jefferson County
Household size in Jefferson County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 3.18 | 2.72 | 2.68 |
| 2010–14 | 3.28 | 2.78 | 2.73 |
| 2015–19 | 3.29 | 2.76 | 2.71 |
| 2020–24 | 3.27 | 2.79 | 2.65 |
| Change | +0.09 | +0.07 | −0.03 |
Jefferson County is a place of big households: 3.27 people per home on average, compared with 2.65 nationally. Numbers like that usually point to plenty of families with kids. Household size has climbed from 3.18 in 2006–10, even as the national average fell. Only one other Idaho county has larger households.
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 County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 30.8 | 35.5 | 37.7 |
| 2010–14 | 31.6 | 36.6 | 38.6 |
| 2015–19 | 31.9 | 37.6 | 39.6 |
| 2020–24 | 32.7 | 38.2 | 40.1 |
| Change | +1.9 | +2.7 | +2.3 |
Jefferson County is young: half of its residents are under 32.7, compared with a national median of 40.1. The population tilts toward young families with children. The median age has climbed from 30.8 in 2006–10, as it has nationally. Only two of Idaho's 44 counties are younger.
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 County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 7.1% | 10.0% | 12.3% |
| 2010–14 | 9.9% | 10.2% | 12.3% |
| 2015–19 | 6.0% | 9.3% | 11.6% |
| 2020–24 | 8.9% | 9.3% | 11.6% |
| Change | +1.8 pts | −0.7 pts | −0.6 pts |
Single parents head about one in twelve households in Jefferson County (8.9%), below the national share of 11.6%. Idaho as a whole looks much the same. The single-parent share is up 1.8 points from 2006–10, even as the national share fell.
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 County
Renters in Jefferson County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 18.1% | 29.0% | 33.3% |
| 2010–14 | 15.9% | 30.8% | 35.6% |
| 2015–19 | 19.3% | 30.0% | 36.0% |
| 2020–24 | 17.0% | 27.9% | 34.8% |
| Change | −1.2 pts | −1.1 pts | +1.5 pts |
Jefferson County is largely a place of homeowners: only 17.0% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Just over a third of owners (35.1%) have paid off their mortgages, below the national share of 39.8%. The renter share is down 1.2 points from 2006–10, even as the national share rose.
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 County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 6.6% | 10.4% | 11.4% |
| 2010–14 | 7.4% | 11.0% | 11.4% |
| 2015–19 | 6.9% | 10.5% | 11.1% |
| 2020–24 | 5.2% | 9.3% | 9.6% |
| Change | −1.4 pts | −1.1 pts | −1.8 pts |
Only 5.2% of homes in Jefferson County are vacant, far below the national rate of 9.6%, which usually means strong demand for housing. Since 2006–10, vacancy has edged down 1.4 points, mirroring the country. Only two of Idaho's 44 counties have a lower vacancy rate.
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 County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 1984 | 1982 | 1974 |
| 2010–14 | 1988 | 1984 | 1975 |
| 2015–19 | 1988 | 1986 | 1977 |
| 2020–24 | 1994 | 1989 | 1980 |
| Change | +10 | +7 | +6 |
Much of the housing in Jefferson County is relatively new: half of its homes were built after 1994, compared with 1980 for the U.S. as a whole. The median year built has moved up from 1984 in 2006–10, a sign of steady new building. The newest homes are mostly in the south, the oldest in the northwest.
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 County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | $623 | $766 | $965 |
| 2010–14 | $676 | $820 | $1,040 |
| 2015–19 | $933 | $941 | $1,213 |
| 2020–24 | $1,282 | $1,407 | $1,571 |
| Change | +$659 | +$641 | +$606 |
Rent in Jefferson County runs $1,282 a month at the median, utilities included, below the U.S. median of $1,571. Rents are up $659 a month from 2006–10, a 106% jump, faster than rents rose nationally. Rent takes 23.9% of the typical renter's income, comfortably under the 30% mark often used to define affordable rent. Renters on a budget will find the lowest rents in the northwest; the highest are in the south.
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 County
Bachelor's degrees in Jefferson County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 18.6% | 25.0% | 28.4% |
| 2010–14 | 21.2% | 25.9% | 29.6% |
| 2015–19 | 24.8% | 27.8% | 32.1% |
| 2020–24 | 28.2% | 31.7% | 35.6% |
| Change | +9.6 pts | +6.6 pts | +7.2 pts |
College degrees are less common in Jefferson County than nationally: 28.2% of adults 25 and older have a bachelor's or higher, against 35.6%. Since 2006–10, the share with a degree has risen 9.6 points, in line with the national trend. College graduates are most concentrated in the east and least in the northwest.
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 County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 86.7% | 88.7% | 84.9% |
| 2010–14 | 90.0% | 89.3% | 86.1% |
| 2015–19 | 90.0% | 90.8% | 87.7% |
| 2020–24 | 93.3% | 92.1% | 89.3% |
| Change | +6.6 pts | +3.4 pts | +4.3 pts |
High school completion in Jefferson County is above the national rate: 93.3% of adults have a diploma or equivalent, against 89.3%. The share with a diploma is up 6.6 points from 2006–10, in line with the national trend. Jefferson County has a higher share of high school graduates than the great majority of Idaho counties.
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 County
| Period | Jefferson County | Idaho | U.S. |
|---|---|---|---|
| 2006–10 | 5.3% | 7.0% | 8.1% |
| 2010–14 | 6.3% | 8.1% | 9.4% |
| 2015–19 | 4.4% | 4.4% | 5.6% |
| 2020–24 | 2.7% | 3.8% | 5.4% |
| Change | −2.6 pts | −3.2 pts | −2.7 pts |
Unemployment in Jefferson County has been low: just 2.7% of the labor force was out of work and looking, well below the national rate of 5.4%. Unemployment is down 2.6 points from 2006–10, mirroring the country. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's 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 County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Jefferson County | 3.27 | 32.7 | 8.9% | 17.0% | 5.2% | 1994 | $1,282 | 28.2% | 93.3% | 2.7% |
| Teton County | 2.94 | 40.0 | 6.3% | 19.2% | 28.5% | 2000 | $1,448 | 49.3% | 92.6% | 1.0% |
| Butte County | 2.52 | 41.5 | 8.1% | 22.5% | 19.7% | 1969 | $619 | 17.8% | 89.2% | 4.5% |
| Blaine County | 2.45 | 46.7 | 9.7% | 26.5% | 23.6% | 1987 | $1,337 | 48.1% | 91.8% | 2.0% |
| Hot Springs County | 2.20 | 43.1 | 7.8% | 27.3% | 12.5% | 1974 | $1,081 | 26.5% | 95.2% | 3.0% |
| Ada County | 2.61 | 39.2 | 8.7% | 29.2% | 5.6% | 1997 | $1,861 | 44.2% | 95.2% | 3.0% |
| Canyon County | 2.93 | 35.6 | 10.8% | 24.5% | 4.7% | 1995 | $1,454 | 23.6% | 87.8% | 3.6% |
| Harney County | 2.38 | 49.8 | 7.5% | 32.6% | 15.8% | 1973 | $717 | 18.0% | 91.2% | 4.0% |
| Custer County | 1.95 | 56.7 | 5.7% | 14.4% | 16.3% | 1993 | $1,227 | 31.7% | 95.2% | 2.1% |
| Jackson County | 3.48 | 34.8 | 27.1% | 32.7% | 21.1% | 1982 | $480 | 14.0% | 90.3% | 8.1% |
| Mellette County | 2.94 | 38.1 | 15.4% | 39.6% | 17.4% | 1969 | $699 | 19.2% | 83.6% | 12.0% |
All figures 2020–24.
Counties with similar populations: Titus County, TX · DeSoto County, FL · Dillon County, SC · Dodge County, NE · Taos County, NM · Tattnall County, GA · Taylor County, FL · Taylor County, KY · Tazewell County, VA · Teller County, CO
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 County. 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.
No other site shows detail at this level for free. We are able to keep this site free by receiving a small commission from the referring links on this page. Please share or cite this page if you aren’t able to otherwise support our work.