What is the most common city name (in the United States)?

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Problem

What is the most common city name (in the United States)?

[ Editor: problem statement reconstructed from the posting, which gives
only the answer. ]

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I have heard the question about the most common city name before.  A
few of the people that answered got what I am pretty sure is the
correct answer.  And the winner is........... SPRINGFIELD!

-- J Miller <miller48@futures.wharton.upenn.edu>, October 1994