Why are inland ports included in the dataset?
Additional port detail was added to the dataset with the January 1997 data month. In addition, in January 1997, all ports that fall within Customs districts for the Canadian and Mexican border customs districts began to be fully captured. At the same time, some additional non-border or inland ports began to be identified separately. Non-border ports with low activity are still combined at their parent Customs district and reported by an ‘XX’ (i.e., ’35XX’).
