Total Population in New Castle County, DE
ACS 2024 5-Year Estimates
How New Castle County Compares
National Distribution
Where New Castle County falls among all 3,222 U.S. counties for total population.
■ New Castle County: 577,961
Ranking Context
| Rank | County | Value |
|---|---|---|
| #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 |
| #125 | South Central Connecticut Planning Region, CT | 570,598 |
Total Population in New Castle County, Delaware
New Castle County, Delaware has a total population of 577,961, which ranks #122 of 3,222 out of 3,222 counties nationwide. This is 99.8% below the national value of 330M.
Within Delaware, New Castle County ranks #1 of 3 out of 3 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.