For all their information gathering, web-based map services can't tell people what side of the street a business is on. This can be an important consideration for how one approaches to avoid left turn delays.
I know someone who ran into this in Las Vegas because the city had odd numbers on one side of the street and the unincorporated area did the opposite. What if the city boundaries change?
I've seen even numbers on both sides of Newhall Ranch Road in Santa Clarita even though that city incorporated long after much of it was built in Los Angeles County--what's up with that?