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400 may refer to:400 (number), the natural number following 399 and preceding 401
A year: 400 BC or AD 400
The Four Hundred, the oligarchic government controlling Athens after the Athenian coup of 411 BC
The Four Hundred, the social elite of New York City in the late 19th century
The Game's Four Hundred, the subtitle of the almanac, the Baseball Register
List of highways numbered 400
Twin Cities 400, a passenger train operated by Chicago & Northwestern Railway from 1935 to 1963
400, a Lebanese trick-taking game
HTTP 400, the HTTP error code for "Bad Request"
Ping Shan stop, Hong Kong; station code
TV400, the former name of Swedish television channel Kanal 11
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