Delaware Population By County in 2018
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 966,985 people living in Delaware in 2018. New Castle County was the most populated county with 557,983 residents, followed by Sussex County with 230,048 residents, and Kent County with 178,954 residents. Kent County with a population of 178,954 was the least populated county in Delaware in 2018.

Use the map below to interactively explore the population of each county in Delaware in 2018. The data can also be explored further by sorting and filtering with the table below.

Hover/Click on the counties to see the values.
Delaware Population By County (2018)
See also Population estimate for other years:
Table of Delaware Population By County in 2018
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County Population % of State Population
Kent 178,954 18.51%
New Castle 557,983 57.70%
Sussex 230,048 23.79%