Delaware Population By County in 2022

Based on the US Census Vintage data estimates, in 2022, the population of Delaware was 1,018,396. Among all Delaware counties, New Castle[object Promise] had the highest population (575,494), followed by Sussex[object Promise] (255,956), and Kent[object Promise] (186,946). Kent[object Promise] was the least populated county (186,946).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

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