Delaware Population By County in 2021 (ACS-5Yrs)

Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Delaware was 981.89K. Among all Delaware counties, New Castle was the most populated county (567.77K), followed by Sussex (234.05K), and then Kent (180.08K).

The chart and table below shows the population of each county and the percentage of Delaware population in each county.

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