This article is from the The Simpsons FAQ, by Ondre Lombard wakkojr@nospam.wcat.com and Andrew Gill superluser@mail.rit.edu with numerous contributions by others.
At 742 Evergreen Terrace, Springfield. Of this, 742 can be debated (in
some episodes, it has been other things), but it is quoted as such at
<http://www.foxworld.com/simpindx.htm> Where is Springfield? North
Tacoma is the official answer. For an explanation, see
<http://www.snpp.com/guides/springfield.list.html>. It has the closest
that you can get to an answer, so let us never speak of it again.
 
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