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 | Official name: State of Delaware Delaware postal code abbreviation: DE Delaware prefix phone numbers: 302 You may also be interested in the answers to the following questions: Total area: 6 452 km2 ✅ What is the largest city by population in Delaware?- Largest Delaware cities by population: Wilmington ✅ What is the capital of Delaware?- State capital of Delaware: Dover ✅ What is the population of Delaware?- Delaware state population 2025: 907 135 |