The U.S. Coast Guard uses a set of 2-letter prefixes for vessel numbers; 33 C.F.R. Pt.173, App. A 39 states and the District of Columbia have the same USPS and USCG abbreviations.
The U.S. Coast Guard uses a set of 2-letter prefixes for vessel numbers, 33 C.F.R. Pt.173, App. A marked (USCG) on the large table above. The other 39 states and the District of Columbia have the same USPS and USCG abbreviations.