Ada County, Idaho
Ada County: County in Idaho, United States
About
Ada County is a county located in the U.S. state of Idaho. As of the 2010 census, the population was 392,365 and a population density of 143 people per km². After 9 years in 2019 county had an estimated population of 481,587 inhabitants. Its county seat is Boise. The county was created 160 years ago in 1864.
Quick Facts about Ada County
| Population : | 481,587 (2019) |
| Country : | United States of America |
| State : | Idaho (United States) |
| Area : | 2746 km2 |
| Water as percent of area : | 0.7% |
| Land as percent of area : | 99.3% |
| Named for : | Ada Riggs |
| Altitude : | 3,179 feet / 969 meters |
| Capital : | Boise |
| Establishment : | December 12, 1864 |
| Time Zone : | America/Boise |
| Local time : | 02:02:00 (22nd February 2025) |
| Density : | 175 Pop. per km² as of 2019 |
| Population growth : | 18.53% (2010-2019) |
Geography
Ada County is located at 43°27'4"N 116°14'28"W (43.4511200, -116.2410900). It has 5 neighbors: Elmore County, Boise County, Canyon County, Gem County and Owyhee County.
Ada County map
icon to open full mode. View satellite images
The largest city of Ada County is Boise with a population of 228,959. Other cities include, Meridian population 114,161, Eagle population 29,796, Kuna population 22,257 and Garden City population 11,969. See all Ada County cities & populated places.
Ada County Populated Places
Cities, towns, neighborhoods & other populated places in Ada County.
| City Name | Population | Title |
|---|---|---|
| Boise | 228,959 | The capital of Idaho. |
| Meridian | 114,161 | The most populous city in Ada County, Idaho. |
| Eagle | 29,796 | City in Ada County, Idaho, United States |
| Kuna | 22,257 | City in Ada County, Idaho, United States |
| Garden City | 11,969 | City in Ada County, Idaho, United States |
| Star | 10,532 | City in Ada County, Idaho, United States |
- Official Website
Official website of Ada County
Ada County has 5 neighbours.
- Elmore County county in Idaho, United States
- Boise County county in Idaho, United States
- Canyon County county in Idaho, United States
- Gem County county in Idaho, United States
- Owyhee County county in Idaho, United States
- Boise
Demographics
The population of Ada County increased by 18.53% in 9 years.
| Year | Population | % Change | Method |
| 2010 | 392,365 | - | census |
| 2011 | 401,262 | 2.22% | estimation process |
| 2012 | 408,862 | 1.86% | estimation process |
| 2013 | 415,951 | 1.7% | estimation process |
| 2014 | 425,471 | 2.24% | estimation process |
| 2015 | 432,862 | 1.71% | estimation process |
| 2016 | 444,486 | 2.62% | estimation process |
| 2017 | 456,548 | 2.64% | estimation process |
| 2018 | 468,764 | 2.61% | estimation process |
| 2019 | 481,587 | 2.66% | estimation process |
Idaho Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Canyon County | 229,849 | County in Idaho, United States |
| Boise | 228,959 | The capital of Idaho. |
| Kootenai County | 165,697 | County in Idaho, United States |
| Bonneville County | 119,062 | County in Idaho, United States |
| Meridian | 114,161 | The most populous city in Ada County, Idaho. |
| Nampa | 99,277 | The most populous city in Canyon County, Idaho. |
| Bannock County | 87,808 | County in Idaho, United States |
| Twin Falls County | 86,878 | County in Idaho, United States |
| Idaho Falls | 62,888 | The most populous city in Bonneville County, Idaho. |
| Caldwell | 58,481 | The most populous city in Canyon County, Idaho. |
| Pocatello | 56,637 | The most populous city in Bannock County, Idaho. |
| Coeur d'Alene | 52,414 | A city in Kootenai County, Idaho. |
| Twin Falls | 50,197 | The most populous city in Twin Falls County, Idaho. |
| Bingham County | 46,811 | County in Idaho, United States |
| Bonner County | 45,739 | County in Idaho, United States |
| Nez Perce County | 40,408 | County in Idaho, United States |
