Related--the "commonly used" address is different from the "official" address. When I moved into my current house, it's official USPS address differed from what many of the local service people thought was the address (and, indeed, what many maps showed to be the address).

In these days of GPS--and just the passage of time--it's not a problem any longer. But for the first five years or so I lived in the house, I had to be careful to explain the situation to people coming to the house.