They don't even identify a single state in all cases[1]. 1. https://gis.stackexchange.com/questions/53918/determining-which-us-zipcodes-map-to-more-than-one-st

They don't even identify a single state in all cases[1]. 1. https://gis.stackexchange.com/questions/53918/determining-which-us-zipcodes-map-to-more-than-one-state-or-more-than-one-city/223445 https://gis.stackexchange.com/questions/53918/determining-wh...