Census 2010: Idaho › Jefferson County

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(Mapping 100 largest census tracts, by 2010 population.)

Jefferson County

Square miles: 1,105.6 Population per sq. mile: 23.9

  • 2010 population: 26,140
  • 2000 population: 19,155
  • Total change: 6,985 (36.5%)

See all Idaho counties

2010 population by race/ethnicity

Diversity Index: 23.3%
The USA TODAY Diversity Index represents the probability that two people from this area will have different ethnic backgrounds. A higher number reflects a more ethnically diverse population.

Age breakdown Median: 30 years old

Jefferson County population

Race/ethnicity2010 population2010 percentage2000 population2000 percentage2000-2010 change
American Indian/Alaska Native2030.8%890.5%128.1%
Native Hawaiian/Pacific Islander230.1%150.1%53.3%
Other race1,5145.8%1,2946.8%17.0%
Two or more races4011.5%2541.3%57.9%
*Hispanic origin2,64110.1%1,90710.0%38.5%

*Residents of Hispanic origin can be of any race.

Ages 0-17

Population: 9,287 (35.5%)

Diversity Index: 37.6%

Ages 18+

Population: 16,853 (64.5%)

Diversity Index: 28.1%

Race/ethnicityAges 0-17% of 0-17 totalAges 18+% of 18+ total
American Indian/Alaska Native740.8%1290.8%
Native Hawaiian/Pacific Islander120.1%110.1%
Other race6346.8%8805.2%
Two or more races2062.2%1951.2%
*Hispanic origin1,18712.8%1,4548.6%

*Residents of Hispanic origin can be of any race.

Population13,114 (50.2%)
Median age30
Population13,026 (49.8%)
Median age30
Age breakdown by gender
AgePopulation% of totalMale% of male totalFemale% of female total
Under 105,44620.8%2,71720.7%2,72921.0%
10 to 19 years4,52017.3%2,33517.8%2,18516.8%
20 to 29 years3,11911.9%1,51011.5%1,60912.4%
30 to 39 years3,49913.4%1,78113.6%1,71813.2%
40 to 49 years3,01811.5%1,52511.6%1,49311.5%
50 to 59 years2,90611.1%1,49411.4%1,41210.8%
60 to 69 years1,9497.5%9687.4%9817.5%
70 to 79 years1,1164.3%5384.1%5784.4%
80 and older5672.2%2461.9%3212.5%

*Residents of Hispanic origin can be of any race.

Household types
Families 2010
Avg. size 3.6
Households 6,698 (82.2%)
Non-families 2010
Avg. size 3.2
Households 1,448 (17.8%)
Family composition
Households ‡ 2010 % of households % of families
Husband-wife family, without children 2,692 33.0% ...
Husband-wife family, with children under 18 years 3,056 37.5% ...
Single male, no children (with other family) 157 1.9% ...
Single male, with children under 18 years 188 2.3% ...
Single female, no children (with other family) 232 2.8% ...
Single female, with children under 18 years 373 4.6% ...
Single male living alone 567 7.0% n/a
Single female living alone 658 8.1% n/a
Other non-family households (ex.: roommates) 223 2.7% n/a
Total 8,146 100% n/a
Family households 6,698 82.2% 100%
Families with children under 18 years 3,617 44.4% ...
Non-family households 1,448 17.8% n/a
All households with individuals 65 years and over 1,748 21.5% n/a

‡ United States Census Bureau definitions:

Household — A household includes all of the people who occupy a housing unit. People not living in households are classified as living in group quarters. (Ex: college residence halls, skilled-nursing facilities, military barracks, …)
Family — A family includes a householder and one or more people living in the same household who are related to the householder by birth, marriage, or adoption.
Non-family Household — A householder living alone or with nonrelatives only.

Note: Family households and husband-wife-couple families do not include same-sex married couples even if the marriage was performed in a state issuing marriage certificates for same-sex couples. Same-sex-couple households are included in the family households category if there is at least one additional person related to the householder by birth or adoption. Same-sex-couple households with no relatives of the householder present are tabulated in nonfamily households.

Housing Units
Avg. household size3.2
Avg. household size3.1
Vacancy Rate2010
Owner-occupied properties1.9%
Renter-occupied properties6.2%
Overall vacancy rate6.6%
Housing Units2010% of total
Vacant576 6.6%
For rent911.0%
Rented, but unoccupied110.1%
For sale1311.5%
Sold, but unoccupied430.5%
Seasonal use only730.8%
Other vacant units2272.6%

Credits: Ryan Pitts, Mike Tigas Special thanks: USA Today Census team