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COUNTY · 1990 CENSUS

Ada County

Idaho · 205,775 residents · 1,052 sq mi
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The short version

Ada County is home to 205,775 people in Idaho. The population has fallen 32% since 2000. That is roughly 20% ahead of the Idaho median. The typical home is worth $70,400. About 25% of adults have finished a four-year degree. 69% of homes are owner-occupied.

At a glance
Average income
near the US median
US median: $30,130
Mid-age
median age 31.9
US median: 33.0
More educated
25% hold a bachelor's degree
US average: 20%
More affordable
home values down 24%, inflation adjusted
US median home: $93,722
Section 01

Population & growth

Total population
205,775
−32%vs 2000
vs 300,904 in 2000
1990 – 2025
Median age
31.9
−3%vs 2000
vs 32.8 in 2000
US average: 33.0
Land area
1,052 sq mi
Population, 1990 – 2024
174K268K362K456K550K19902000201020202024Ada County
2024519K
1990201020202024
Age distribution, 1990
Under 57.6%(15,722)
US avg: 7.3%
5 to 98.4%(17,189)
US avg: 7.3%
10 to 147.9%(16,336)
US avg: 6.9%
15 to 197.1%(14,649)
US avg: 7.1%
20 to 246.9%(14,291)
US avg: 7.5%
25 to 3417.8%(36,545)
US avg: 17.5%
35 to 4417.3%(35,522)
US avg: 15.1%
45 to 549.7%(20,045)
US avg: 10.2%
55 to 646.8%(14,057)
US avg: 8.5%
65 to 746.1%(12,573)
US avg: 7.3%
75 to 843.4%(7,014)
US avg: 4%
85 and over0.9%(1,832)
US avg: 1.2%
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Section 02

Income & economy

Median household income
$30,246
−14%inflation adjusted, since 2000
vs $46,140 in 2000
US average: $30,130
1990 – 2024
Per capita income
$14,268
−37%vs 2000
vs $22,519 in 2000
US average: $14,340
Poverty rate
8.8%
+1.2 ptsvs 2000
vs 7.7% in 2000
US average: 13.2%
Section 03

Housing

Median home value
$70,400
−24%inflation adjusted, since 2000
vs $122,400 in 2000
US average: $93,722
1990 – 2024
Median gross rent
$401
−14%inflation adjusted, since 2000
vs $617 in 2000
US average: $450
Owner-occupied
69.1%
−1.6 ptsvs 2000
vs 70.7% in 2000
30.9% rent
Section 04

Race & ethnicity

2000
White, non-Hispanic90.6%(272,569)
Black0.6%(1,829)
Hispanic / Latino4.5%(13,467)
Asian1.7%(5,140)
Other0%
1990
White, non-Hispanic96.8%(199,254)
Black0.6%(1,161)
Hispanic / Latino2.5%(5,216)
Asian1.2%(2,386)
Other1.4%(2,974)

No data for the years selected.

Section 04 · Origins

Detailed origins & ancestry

Detailed origin tables are available for 2024; showing 2024 data.

Hispanic origin
Mexican7%(36,231)
South American0.7%(3,442)
Puerto Rican0.4%(2,200)
Central American0.4%(2,030)
Spaniard0.4%(1,850)
Colombian0.2%(1,207)
Peruvian0.2%(1,176)
Guatemalan0.2%(858)
Salvadoran0.1%(709)
Cuban0.1%(651)
Ecuadorian0.1%(354)
Venezuelan0.1%(347)
+ 9 more hispanic origin groups with data
Dominican0%(223)
Argentine0%(216)
Panamanian0%(209)
Nicaraguan0%(112)
Chilean0%(57)
Bolivian0%(21)
Honduran0%(20)
Asian origin
Asian Indian0.5%(2,678)
Chinese0.4%(2,189)
Filipino0.3%(1,789)
Korean0.3%(1,522)
Vietnamese0.3%(1,423)
Japanese0.2%(1,148)
Kazakh0.1%(778)
Nepalese0.1%(515)
Laotian0.1%(421)
Pakistani0.1%(298)
Thai0.1%(280)
Taiwanese0%(121)
+ 8 more asian origin groups with data
Burmese0%(109)
Cambodian0%(63)
Malaysian0%(38)
Hmong0%(8)
Pacific Islander origin
Chamorro0.1%(384)
Samoan0.1%(355)
Tongan0%(134)
Guamanian0%(50)
Fijian0%(15)
Ancestry
English19.8%(102,556)
German18%(93,607)
Irish11.4%(59,205)
American4.3%(22,141)
Italian4.2%(21,805)
Scottish3%(15,800)
Norwegian2.9%(15,009)
Swedish2.6%(13,495)
French2.3%(12,107)
Polish1.8%(9,531)
Dutch1.6%(8,377)
Danish1.4%(7,119)
+ 49 more ancestry groups with data
Welsh1.3%(6,496)
Scotch-Irish0.9%(4,507)
British0.7%(3,670)
Russian0.6%(3,327)
French Canadian0.6%(3,001)
Arab0.6%(2,967)
Swiss0.6%(2,929)
Portuguese0.5%(2,810)
Ukrainian0.5%(2,373)
Czech0.4%(2,229)
Hungarian0.3%(1,724)
Greek0.3%(1,627)
Finnish0.3%(1,546)
Canadian0.2%(1,192)
Austrian0.2%(833)
Croatian0.2%(785)
Lebanese0.1%(756)
Romanian0.1%(717)
Iraqi0.1%(670)
Lithuanian0.1%(627)
West Indian0.1%(542)
Iranian0.1%(465)
Belgian0.1%(424)
Slovak0.1%(342)
Serbian0.1%(334)
Israeli0.1%(330)
Armenian0.1%(327)
Somali0.1%(300)
Syrian0.1%(280)
Turkish0%(246)
Slovene0%(230)
Australian0%(219)
Nigerian0%(216)
Haitian0%(201)
Ethiopian0%(167)
Bulgarian0%(158)
Egyptian0%(156)
Brazilian0%(148)
Latvian0%(131)
Jamaican0%(118)
Ghanaian0%(52)
Moroccan0%(48)
Guyanese0%(33)
Kenyan0%(7)
Section 05

Education

Bachelor's degree or higher
24.9%
−6.3 ptsvs 2000
vs 31.2% in 2000
US average: 20.3%
High school or higher
87.2%
−3.6 ptsvs 2000
vs 90.8% in 2000
US average: 75.2%
Graduate degree
7.4%
−2.1 ptsvs 2000
vs 9.5% in 2000
US average: 7.1%
Section 06

Commute & transportation

Average commute
17.2 min
+51%vs 2000
vs 11.4 min in 2000
US average: 21.9
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

Marital status (2024)
Men 15+
Never married33.6%(71,985)
Married54.4%(116,615)
Widowed1.9%(4,041)
Divorced10.1%(21,622)
Women 15+
Never married26.5%(56,309)
Married53.5%(113,636)
Widowed6.9%(14,717)
Divorced13.1%(27,865)
SHARE WITHIN EACH SEX · POPULATION 15 AND OVER · 2024
Section 09

Health coverage

Showing 2024 (the nearest year with coverage data).

Uninsured
6.4%
−6.6 ptssince 2013
from 13.0% in 2013
US average: 8.4%
Employer-based
61.0%
−1.0 ptssince 2020
from 62.0% in 2020
US average: 54.8%
Direct-purchase
16.2%
−1.2 ptssince 2020
from 17.4% in 2020
US average: 13.8%
Medicare
16.9%
+1.4 ptssince 2020
from 15.5% in 2020
US average: 18.4%
Medicaid
13.2%
+2.0 ptssince 2020
from 11.2% in 2020
US average: 20.9%
VA health care
2.7%
−0.1 ptssince 2020
from 2.8% in 2020
US average: 2.2%
Any private
76.2%
−2.6 ptssince 2020
from 78.8% in 2020
US average: 67.1%
Any public
29.4%
+3.8 ptssince 2020
from 25.6% in 2020
US average: 36.7%

Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.

Section 09 · Service history

Veterans

Veterans by period of service, 2024
Gulf War (2001 or later)30.7%(9,675)
US avg: 26.4%
Gulf War (1990s)27.9%(8,800)
US avg: 24.3%
Vietnam era30.4%(9,573)
US avg: 33.1%
Korean War3.2%(997)
US avg: 4.5%
World War II0.3%(79)
US avg: 1%

Share of the 31,500 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.

BAR + DOT: THIS PLACE · TICK: US AVERAGE
Drill deeper

Places similar to Ada County

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Pop 535,799
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Pop 588,026
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Pop 554,668
Delaware County
Pop 580,937
Places similar to Ada County
Head to head

Compare Ada County to nearby counties

ADA COUNTY VS
Canyon County
Income$76,488+153%
Home value$390,000+454%
Population275,123−50%
SEE FULL COMPARISON →
ADA COUNTY VS
Elmore County
Income$65,359+116%
Home value$316,500+350%
Population29,465−95%
SEE FULL COMPARISON →
ADA COUNTY VS
Gem County
Income$64,605+114%
Home value$428,700+509%
Population21,773−96%
SEE FULL COMPARISON →
ADA COUNTY VS
Boise County
Income$78,774+160%
Home value$476,100+576%
Population8,545−98%
SEE FULL COMPARISON →
Frequently asked

How many people live in Ada County, Idaho?

Ada County, Idaho has about 205,775 residents according to the 1990 Census.

What is the median household income in Ada County, Idaho?

The typical household in Ada County, Idaho earns about $30,246 a year. Half of households make more than that, and half make less.

Is Ada County, Idaho expensive?

In Ada County, Idaho, the median home is worth about $70,400, and the typical rent is about $401 a month.

How educated are people in Ada County, Idaho?

About 24.9% of adults age 25 and over in Ada County, Idaho hold a bachelor's degree or higher.

What is the poverty rate in Ada County, Idaho?

About 8.8% of people in Ada County, Idaho live below the federal poverty line.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

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