Delaware Counties by Population

The most populated counties in Delaware are New Castle County with 578,592, Sussex County at 263,509, and Kent County with 189,789. You can get the most current Census population data for all 3 Delaware counties, sorted from the most populous counties in Delaware to the least, according to the 2023 Population Estimates Program.

Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Delaware counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!