Notes:

Interstate segment boardings are assigned to the state of origin. BC and ON are included on the map as there was reported ferry traffic destined to a U.S. terminal from these Canadian provinces. A state’s data is suppressed when all reporting operators in the state chose for their data to not be disclosed to the public. States with no data have no ferry operations.  (*) Arizona has 1 ferry operation, which submitted their 2016 NCFO, but did not report boarding counts.

Source:

U.S. Department of Transportation, Bureau of Transportation Statistics, National Census of Ferry Operators 2016, Appendix A, Table 1, available at www.bts.gov as of October 2017.