About Ada County
Ada County is a city located in United States, in the Idaho region. According to the latest available data (2026), the population of Ada County is approximately 494,967 residents, making it the #147 most populous city in United States.
Globally, Ada County ranks #3,772 among the world's most populated cities.
Ada County City Statistics
| City | Ada County |
| Country |  United States |
| Population | 494,967 |
| Global Rank | #3,772 |
| Rank in United States | #147 of 867 cities |
| City Category | city |
| Region | Idaho |
| Latitude | 43.45 |
| Longitude | -116.24 |
| Data Year | 2026 |
Where is Ada County Located?
Ada County is located in United States, in the Idaho region, at coordinates 43.45° latitude and -116.24° longitude. Located in the mid-latitudes, Ada County experiences distinct four-season weather patterns.
Nearby Cities
Other Cities in United States
Largest Cities in United States
| # | City | Population |
|---|---|---|
| 1 | Harris County | 4,731,145 |
| 2 | Los Angeles | 3,898,747 |
| 3 | San Diego County | 3,298,634 |
| 4 | Brooklyn | 2,736,074 |
| 5 | Miami-Dade County | 2,701,767 |
Frequently Asked Questions
What is the population of Ada County?
The population of Ada County is approximately 494,967 residents according to the latest available data (2026).
Where is Ada County located?
Ada County is located in United States at approximately 43.45° latitude and -116.24° longitude.
Is Ada County one of the largest cities in United States?
With a population of 494,967, Ada County is one of the notable urban areas in United States. It ranks #147 out of 867 cities in the country.
