Demographic Data Report for Delaware by County Population: Age under 18 "All Races (includes Hispanic), Both Sexes" 2017-2021 American Community Survey 5-Year Data Sorted by Value County, FIPS,Value (Percent),People (Age Under 18),Rank within US "Delaware",10000,21.1,207645,"39 of 52" "United States",00000,22.5,74234075,"N/A" "Sussex County",10005,18.6,43455,"2742 of 3143" "New Castle County",10003,21.6,122616,"1874 of 3143" "Kent County",10001,23.1,41574,"1211 of 3143" Created by statecancerprofiles.cancer.gov on 03/28/2024 4:09 am. Source: Demographic data provided by the Census Bureau (http://www.census.gov/) & the American Community Survey (http://www.census.gov/acs/www/). "For more information about Population: Age under 18, see the dictionary at http://statecancerprofiles.cancer.gov/dictionary.php#population." Data for United States does not include Puerto Rico.