Total Population in Ada County, ID
ACS 2024 5-Year Estimates
How Ada County Compares
National Distribution
Where Ada County falls among all 3,222 U.S. counties for total population.
■ Ada County: 518,935
Ranking Context
| Rank | County | Value |
|---|---|---|
| #137 | Sedgwick County, KS | 528,226 |
| #138 | Camden County, NJ | 527,257 |
| #139 | Passaic County, NJ | 521,012 |
| #140 | Ada County, ID | 518,935 |
| #141 | Kane County, IL | 517,255 |
| #142 | Clark County, WA | 516,959 |
| #143 | Morris County, NJ | 514,528 |
Total Population in Ada County, Idaho
Ada County, Idaho has a total population of 518,935, which ranks #140 of 3,222 out of 3,222 counties nationwide. This is 99.8% below the national value of 330M.
Within Idaho, Ada County ranks #1 of 44 out of 44 counties. This places it in the 96th percentile nationally.
Total population count from the American Community Survey. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.