Delaware 2019 Population By County

Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 976,668 people living in Delaware in 2019. New Castle County was the most populated county with 559,941 residents, followed by Sussex County with 235,235 residents, and Kent County with 181,492 residents. Kent County with a population of 181,492 was the least populated county in Delaware in 2019.

Use the map below to interactively explore the population of each county in Delaware in 2019. The data can also be explored further by sorting and filtering with the table below.

Delaware 2019 Population By County
See also Population estimate for other years:
Table of Delaware 2019 Population By County
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County Population % of State Population
Kent 181492 18.58
New Castle 559941 57.33
Sussex 235235 24.09