Ada County Flag

Ada County

State:
Idaho
County Seat:
Boise

Ada County's estimated 2025 population is 536,011 with a growth rate of 1.07% in the past year according to the most recent United States census data. Ada County is the  largest county in Idaho. The 2010 population was 393,369 and has seen a growth of 36.26% since that time.

536,011
Total Population
510
Population Density (mi²)
1
Population Rank (State)
5.7K 1.07%
Annual Population Growth

Ada County Population

Ada County Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Ada County includes 84.76% White, and smaller percentages for other race, Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Other race

Asian

Black or African American

Native American

Native Hawaiian or Pacific Islander

Race
Population
Percentage (of total)
White430,62984.76%
Two or more races39,7437.82%
Other race14,1982.79%
Asian12,8712.53%
Black or African American6,5101.28%
Native American3,2110.63%
Native Hawaiian or Pacific Islander8900.18%

Ada County Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Ada County's average per capita income is $52,567. Household income levels show a median of $88,907. The poverty rate stands at 8.53%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$119,551$156,615
Families$107,531$141,995
Households$88,907$121,034
Non Families$55,357$73,821

$52,567

Average Income

$88,907

Median Household Income

8.53%

Poverty Rate