Delaware 2019 Population By County
Updated on June 22, 2021.

According to the US Census Bureau population estimates, there were 973,764 people living in Delaware in 2019. New Castle County was the most populated county with 558,753 residents, followed by Sussex County with 234,225 residents, and Kent County with 180,786 residents. Kent County with a population of 180,786 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 180,786 18.57%
New Castle 558,753 57.38%
Sussex 234,225 24.05%