Merriam-Webster's Learner's Dictionary outside of chiefly US:outside
▪ We waited outside of the store. ▪ We live outside of the city. ▪ people outside of the group ▪ Nobody knew outside of a few close friends.
This AmE-speaker finds emsr2d2's separate explanations more convincing than the all-inclusive definition from the Merriam-Webster's Learner's Dictionary. I have rarely heard "outside of" used in relation to a place.