Median Age in New Castle County, DE
ACS 2024 5-Year Estimates
39.3 years
Rank #2,307/3,222 · #2 in DE
28th
New Castle 39.3 years
DE 41.6 years -5.5%
US 38.9 years +1.0%
Median Age Trend
Rankings →Percentile Rank Over Time
Year-over-Year Age Change
National Distribution
How New Castle County's median age of 39.3 years compares to all 3,222 U.S. counties. Values range from 21.4 years to 86.2 years.
Distribution of Median Age Across All Counties
Ranking Context
Counties ranked closest to New Castle County for median age.
Nearby Rankings
Full ranking →| #2,304 | Calhoun County, AL | 39.3 years |
| #2,305 | Miller County, AR | 39.3 years |
| #2,306 | Yell County, AR | 39.3 years |
| #2,307 | New Castle County, DE | 39.3 years |
| #2,308 | Rockdale County, GA | 39.3 years |
| #2,309 | Campbell County, KY | 39.3 years |
| #2,310 | Powell County, KY | 39.3 years |
About Median Age
New Castle County, Delaware has a median age of 39.3 years, ranking #2,307 of 3,222 counties nationwide — 1.0% above the national value of 38.9 years. Within Delaware, it ranks #2 of 3. This places it in the 28th percentile nationally.
The median age of the total population. 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.