Delaware Population By County in 2018
Updated on November 12, 2020.

According to the US Census Bureau population estimates, there were 965,479 people living in Delaware in 2018. New Castle was the most populated county with 557,550 residents, followed by Sussex with 229,389 residents, and Kent with 178,540 residents. Kent with a population of 178,540 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 178,540 18.49%
New Castle 557,550 57.75%
Sussex 229,389 23.76%