Delaware

Postal abbreviation DE. 96 ZIP codes across 3 counties.

Population1,021,191
Postal abbreviationDE
ZIP codes96 ZIP codes →
Area codes302
Time zoneEastern
Counties3

Largest cities by population

Wilmington · 71,727Dover · 39,837Newark · 30,330Middletown · 24,661Bear · 22,370

Largest counties by population

New Castle County · 577,961Sussex County · 255,626Kent County · 187,604

Counties in Delaware

Kent CountyNew Castle CountySussex County

Population: U.S. Census Bureau, ACS 5-year estimates, 2024.