I'm looking into geocoding U.S. locations without using Google or Bing. I found a service that geocodes according to the Tiger Census data of 2013. I have little knowledge about this Census and didn't get extremely far poking it around. When I use the api of the service that geolocates based on that census, I get several possibilities for the same full address in some cases. E.g. I got that one address in San Francisco is related to 3 different zip codes (that address, randomly picked, is "1354 Market St, San Francisco, CA")
Is that at all possible in the U.S. zip code system?
Do you think the Tiger Census data of 2013, is a very good source for geocoding?