NNon Postal Community Name: Former Postal Facility 
PPost Office: An official post office branch.
UUrbanization: A postal designation specific to Puerto Rico.
BBranch: A postal facility that is not the main post office and is outside the corporate limits of a city.
AAirport Mail Facility: Facilities through which US mail is flown in and out of a city.
CCommunity Post Office: a contract postal unit providing mail services to small communities.
SStation: A post office that is not the main office for a city but is in corporate city limits.
KBulk Mail Center: Centers that handle bulk mail. Typically commercial, business and advertising mail.