I think that defining the term related to the distance one is from the area is spot on. The examples that have been pointed out such as someone from the suburbs saying that they are going downtown might mean that they are going
anywhere in the city, where someone living in Lincoln Park might have a more "micro" view of what downtown is. Another example that confirms this theory is that when traveling out of town, a person who lives in Naperville, for example, might say they are from Chicago when asked where they live.
Steve Z.
“Only the pure in heart can make a good soup.”
― Ludwig van Beethoven