Delaware Population By County in 2018

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.

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

You can see similar information for other states and by state for the United States.