439 miles
The World Bank headquarters are in Washington, DCTo be specific:1818 H Street Northwest Washington, DC 20433, United States(202) 477-0138
The correctly punctuated sentence is: "Send a card to 1234 Broad St, Washington, DC, to let us know what you think." Be sure to capitalize "Broad St" and include commas after "St" and "DC" for proper formatting.