743 Evergreen Terrace.
More than that, we don’t need to know.
My favorite Simpson’s “location gag” was when Skinner was bragging about the progress the school has made: “This used to be the worst school in all of Kentucky (or whatever)… So they picked it up and moved it HERE!”
Then you can not simultaneously accept that the abbrieviation NT would locate Springfield in Australia, while denying that the zip code 49007 puts it smack in the middle of Kalamazoo, Michigan.
Next?
It was actually Chalmers’s line. The other thing that was funny about that bit is that Lisa hasps, giving you enough time to think ‘he said they’re in Missouri!’ before he adds “…so they packed it up and moved it here.”
[url=“http://www.csupomona.edu/~jelerma/springfield/map/index.html”]Map of Springfield[/ur]
Recently added to the Harvard Map Collection, the oldest map collection in America.
“The swankiest street in the classiest part of Pressboard Estates”.
Please. You’ve been had. A little mis-direction and you are lost. 49007 is not a zip code. It is a thinly veiled reference. The first thing an intelligent man thinks when he sees that number is, naturally, that it is part of the ISBN unique machine-readable identification number, which marks any book unmistakably. To the trained eye the string is easily identifiable as being part of the greater string ‘ISBN 0 7315 49007’. Look familiar? To all but the most ignorant cads this should be readily recognized as the ID for the published paper entitled “Three Nations . . .”, which discussed the determinants of indigenous employment outcomes and importance of education and training in Australia. Written by Dr. Boyd Hunter of the Centre for Aboriginal Economic Policy Research at the Australian National University, as you well know, this paper deals with the cultural and economical ramifications of Australia having the often spoken about metaphorical 3 classes (rich, poor, indigenous).
Now, what do you suppose that a paper having to do with the social norms in a country establishing a class of people who are uneducated, get arrested often, and have environmental and lifestyle related health problems, could ever have to do with the Simpsons? Groenig has obviously used this in an attempt to warn us of the dangers of the path that we are on. A situation that results in a part of the population being Simpson-esque can only be in for trouble - as are the indigenous peoples of Australia (who do make the finest iocane powder it must be said). The numbers 47009 are obviously Matt’s (weak) attempt at intellectualism/prognostication.
Thanks for playing though . . .
DaLovin’ Dj
According to the US Postal Service:
States that have a Springfield
Arkansas
Colorado
Georgia
Idaho
Illinois
Kentucky
Louisiana
Maine
Massachusetts
Michigan
Minnesota
Missouri
Nebraska
New Hampshire
New Jersey
Ohio
North Carolina
Oregon
Pennsylvania
South Carolina
South Dakota
Tennessee
Texas
Vermont
Virginia
West Virginia
Wisconsin
States that have no Springfield
Alabama*
Alaska
Arizona*
California*
Connecticut
Delaware
Florida
Hawaii
Indiana*
Iowa*
Kansas
Maryland
Mississippi*
Montana
Nevada
New Mexico
New York*
North Dakota
Oklahoma
Rhode Island
Utah*
Washington
Wyoming
Designates states that have a Springville* but not Springfield.
Actually, that’s most likely the Bush/Ford house. The Simpsons live at 742. 
They’re states that have a city called Springfield. Multimap finds locations called Springfield in Arizona, Alabama and Alaska - I couldn’t be bothered continuing …admittedly the Arizonan one looks to be a field or something…
We also know the Simpsons live 648 miles from Mexico City. I recall having at atlas at home and, after I heard this, discovering to my surprise that this meant Springfield HAD to be in the southern part of Texas. Of course, other parts of the show’s geography doesn’t fit with that - for example, the birthplace of the late Norman Vincent Peale is in Springfield, and he’s from Ohio.
Much, much more about Springfield.
Like it or not, dj, your question has been answered. They don’t live anywhere in the real United States. Unless you know of a state founded by circus freaks with the flag that says “Not just another state.”
Now, there’s plenty of Springfields to choose from…so maybe we should concentrate on the four Shelbyvilles in the US?
Don’t forget it’s also within driving distance of Vegas.
Dude, I know it is a cartoon. I, no we, meaning me and the people in the thread who don’t feel the need to state the blatantly obvious repeatedly, are playing a G-A-M-E. Once again for the slow, I quote:
The fact that there is contradictory evidence does not mean that one cannot come up with fun and humorous reasons why certain facts should be dismissed as propaganda and others as real clues. The fact that there is no ‘real’ answer doesn’t matter. It’s the journey that is important baby. Catch up. Stop pissing on the game or just play it. . .
DaLovin’ Dj
I’ve been playing along, Dude, if you read every sentence I’ve posted here except for that one.
there are many springfields around the US. scroll down at the following link.
Ohio
When calling for replacement parts for Lisa’s toy puzzle-thingie, Marge was heard saying:
“Thats 742 Evergreen Terrace. Springfield, O-HIYA Maud!!”
As Muad Flanders walks by.
I am in driving distance of Vegas. Am I in Springfield? 
Obviously Springfield is on the West Coast, since in the episode with the Guatamalan Insanity Peppers Marge says that Homer would walk west since the ground slopes down that way. Homer ends up at the lighthouse, so the city must be on the western seaboard. Unless Springfield is on a peninsula, and with only one bridge out of town it might even be on an island.