How many letters does the top answer for “which city is the capital of the united states of america” have?

The most common answer is dc (2 letters).

Crossword clue: which city is the capital of the united states of america

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

dc 2 letters otdb

the district occupied entirely by the city of Washington; chosen by George Washington as the site of the capital of the

washington 10 letters otdb

the capital of the United States in the District of Columbia and a tourist mecca; George Washington commissioned Charles

united states of america (abbreviation) 50% similar → usa