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Washington DC has 30 different ZIP codes, starting at 20001 and ending at 20502, at this time.

At least a dozen of these ZIP codes are direct descendants of the Zone system used before the 1963 introduction of the ZIP codes. For example a letter sent in 1962 would have been addressed to "Washington DC, 6" in 1964 would have been addressed to "Washington DC, 20006".

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Q: What is Washington DC zip code?
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