Total Population in Delaware County, PA
ACS 2024 5-Year Estimates
579,222
Rank #121/3,222 · #5 in PA
96th
Delaware 579,222
PA 13M -95.6%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Delaware County's total population of 579,222 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 Delaware County for total population.
Nearby Rankings
Full ranking →| #118 | Volusia County, FL | 579,622 |
| #119 | Jefferson County, CO | 579,377 |
| #120 | Union County, NJ | 579,290 |
| #121 | Delaware County, PA | 579,222 |
| #122 | New Castle County, DE | 577,961 |
| #123 | Baltimore city, MD | 573,243 |
| #124 | Dane County, WI | 572,674 |
About Total Population
Delaware County, Pennsylvania has a total population of 579,222, ranking #121 of 3,222 counties nationwide — 99.8% below the national value of 330M. Within Pennsylvania, it ranks #5 of 67. 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.