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1.
ZIP Code for part of Austin, TX - south central, more or less. Often seen on bumper stickers claiming that it's more than a ZIP Code. I've yet to see how.
"I live in 78704."

"Wow, you must be a really unique individual."

"Yeah, that's why I have the same corny bumper sticker that everyone else around here has."
by mosthorrorshow January 25, 2008
 
2.
The zip code for part of Downtown Austin, TX which contains 6th Street and UT.
"78704 it's not just a zip code it's a way of life"
by JaEz August 15, 2007