The article, from the New York Times, features a few geographical collisions between fan bases, including the Mets and Phillies. What to take note of in those maps and even the one I have supplied above, is that the Mets are never preferred to the Yankees in any zip code. None. Hear that Mets fans? You will always be number 2.
Something that is interesting is that the "dead" spaces that do not have a primary team's color, minus Arizona (Diamondbacks will show up on the interactive map) is that it's always the Yankees. The Yankees have "big" fan bases in Montana, the Carolinas and even Alaska. They must be Lakers and Cowboys fans too (been a rough year for those fans, aww).
Another cool graph to look at is the border of Mets fans to Phillies fans including the dialectical nuances of calling it a hoagie or a sub. There are some Mets fans that correctly call a hoagie a hoagie (they're somewhat okay), and then the rest call it a sub. Personally, I could look at these maps all day. I really like how they paired this specific Phillies-Mets map with the dialectical survey map which came out last year and is also very interesting. If you are curious about the origin in the words you use and the pronunciations you can sometimes be made fun of, take this test so you can back up what you're saying.
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