During my first year of college, I had an acquaintance who told everyone that he was from Chicago. Chicago, if I remember correctly, is located in the state of Illinois. Later, it was revealed that he was not, in fact, from Chicago, but from a little town in the Hoosier State, good old INDIANA.
I'm from Philadelphia, Pennsylvania. My mailing address is Philadelphia, Pennsylvania. If you look on a map, my house resides well within the Philadelphia city lines.
Given the little tidbits that I've just provided, let's play a game. How many times do you think I've had the conversation below?
Me (usually after an introduction): "I'm from Philly." (Or if I'm trying to be gangsta: "I'm from the Illadelph", "I'm from the 215", or "I'm from the home of World Series Champions the Philadelphia Phillies".)
Fake Philadelphian: "You're from Philadelphia?!?! Me too!"
Me: "Oh, that's awesome. What part of Philly are you from?"
Fake Philadelphian: "Oh actually, I'm from Mt. Laurel, New Jersey." (Or "Camden, New Jersey" or "Bucks County, Pennsylvania".)
Me: Soooo, you're not actually from Philadelphia...
Fake Philadelphian: "No, but I live close."
If your guess is a million, you're right!
So let's clarify something here. Close does not equal within. If you're from Radnor, Pennsylvania, you are NOT from Philadelphia. Look at a map; it's plain as day. Simple. Fact.
Why not just say, "I'm from Glassboro, New Jersey. It's a suburb of Philadelphia."? That way, you're not a) lieing and b) potentially angering any actual Philadelphia-native that is within earshot.
Additionally, have a little pride in your native hometown! If you're from Podunktown, Indiana just say you're from Podunktown, Indiana. There's no shame in it!!! Why try to pass yourself off for something you're not, especially when you're trying to pass yourself off to be from a state that you don't even live in! I can kind of understand saying you live in Chicago, if, for example, you live in Evanston, Illinois (even though I FIRMLY believe that you should articulate those specifics), but there is absolutely NO EXCUSE to claim you're from a city that's not even IN THE SAME STATE as the city that you're actually from. You're misrepresenting and that isn't cool!