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 | Official name: Washington District of Columbia Washington, DC postal code abbreviation: WA Washington, DC prefix phone numbers: 202 You may also be interested in the answers to the following questions: Total area: 180 km2 ✅ What is the largest city by population in Washington, DC?- Largest Washington, DC cities by population: ✅ What is the capital of Washington, DC?- State capital of Washington, DC: ✅ What is the population of Washington, DC?- Washington, DC state population 2025: 692 683 |