The best way to confirm an address is by looking up the ZIP code, which can be done at USPS.com. To do this, enter the address given, including the street number, name, city and state.
The tool also allows users to enter a street address and ZIP code and look at the standard way of writing that address. However, it can't tell the user if that is, in fact, where said business or residence resides. It only confirms that a street address, city, state, and zip code match one in the USPS database. This tool also provides other benefits, including giving a list of all cities with a certain ZIP code.