Total Population in Polk County, IA
ACS 2024 5-Year Estimates
503,175
Rank #144/3,222 · #1 in IA
96th
Polk 503,175
IA 3,210,507 -84.3%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Polk County's total population of 503,175 compares to all 3,222 U.S. counties. Values range from 33 to 9,808,667.
Distribution of Total Population Across All Counties
Ranking Context
Counties ranked closest to Polk County for total population.
Nearby Rankings
Full ranking →| #141 | Kane County, IL | 517,255 |
| #142 | Clark County, WA | 516,959 |
| #143 | Morris County, NJ | 514,528 |
| #144 | Polk County, IA | 503,175 |
| #145 | Lake County, IN | 500,379 |
| #146 | Washoe County, NV | 497,200 |
| #147 | Richmond County, NY | 494,956 |
About Total Population
Polk County, Iowa has a total population of 503,175, ranking #144 of 3,222 counties nationwide — 99.8% below the national value of 330M. Within Iowa, it ranks #1 of 99. This places it in the 96th percentile nationally.
Total population count from the American Community Survey. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.