Census 2010: Idaho › Ada County

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

Ada County

Square miles: 1,060.5 Population per sq. mile: 372.8

  • 2010 population: 392,365
  • 2000 population: 300,904
  • Total change: 91,461 (30.4%)

See all Idaho counties

2010 population by race/ethnicity

Diversity Index: 25.6%
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: 34.8 years old

Ada County population

Race/ethnicity2010 population2010 percentage2000 population2000 percentage2000-2010 change
American Indian/Alaska Native2,6100.7%2,0850.7%25.2%
Native Hawaiian/Pacific Islander8610.2%4480.1%92.2%
Other race9,5292.4%5,0251.7%89.6%
Two or more races11,1702.8%6,7542.2%65.4%
*Hispanic origin27,9057.1%13,4674.5%107.2%

*Residents of Hispanic origin can be of any race.

Ages 0-17

Population: 103,706 (26.4%)

Diversity Index: 39.0%

Ages 18+

Population: 288,659 (73.6%)

Diversity Index: 25.2%

Race/ethnicityAges 0-17% of 0-17 totalAges 18+% of 18+ total
American Indian/Alaska Native6570.6%1,9530.7%
Native Hawaiian/Pacific Islander2490.2%6120.2%
Other race3,2763.2%6,2532.2%
Two or more races5,6515.4%5,5191.9%
*Hispanic origin10,85610.5%17,0495.9%

*Residents of Hispanic origin can be of any race.

Population196,501 (50.1%)
Median age34.1
Population195,864 (49.9%)
Median age35.6
Age breakdown by gender
AgePopulation% of totalMale% of male totalFemale% of female total
Under 1058,42114.9%29,73815.1%28,68314.6%
10 to 19 years55,34914.1%28,42114.5%26,92813.7%
20 to 29 years54,93414.0%28,11814.3%26,81613.7%
30 to 39 years56,63314.4%29,08614.8%27,54714.1%
40 to 49 years55,77814.2%28,32414.4%27,45414.0%
50 to 59 years50,50212.9%24,94012.7%25,56213.1%
60 to 69 years33,2198.5%16,2798.3%16,9408.6%
70 to 79 years16,1284.1%7,2993.7%8,8294.5%
80 and older11,4012.9%4,2962.2%7,1053.6%

*Residents of Hispanic origin can be of any race.

Household types
Families 2010
Avg. size 3.1
Households 99,282 (66.9%)
Non-families 2010
Avg. size 2.6
Households 49,163 (33.1%)
Family composition
Households ‡ 2010 % of households % of families
Husband-wife family, without children 41,769 28.1% ...
Husband-wife family, with children under 18 years 36,039 24.3% ...
Single male, no children (with other family) 2,612 1.8% ...
Single male, with children under 18 years 3,991 2.7% ...
Single female, no children (with other family) 5,589 3.8% ...
Single female, with children under 18 years 9,282 6.3% ...
Single male living alone 16,407 11.1% n/a
Single female living alone 20,768 14.0% n/a
Other non-family households (ex.: roommates) 11,988 8.1% n/a
Total 148,445 100% n/a
Family households 99,282 66.9% 100%
Families with children under 18 years 49,312 33.2% ...
Non-family households 49,163 33.1% n/a
All households with individuals 65 years and over 29,553 19.9% 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 size2.7
Avg. household size2.4
Vacancy Rate2010
Owner-occupied properties3.1%
Renter-occupied properties7.9%
Overall vacancy rate6.9%
Housing Units2010% of total
Vacant11,026 6.9%
For rent4,0382.5%
Rented, but unoccupied2370.1%
For sale3,2842.1%
Sold, but unoccupied4660.3%
Seasonal use only1,0180.6%
Other vacant units1,9831.2%

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