The top 25 tonnage ports handled a total of 1.8 billion tons of cargo in 2021—about 72.8 percent of the tonnage handled by the top 100 ranked ports. The top 100 ports account for 94.8 percent of the total tonnage handled by U.S. ports. 

The highest tonnage figures are associated with ports which handle large quantities of both liquid bulk cargo (e.g., petroleum or chemicals) and dry bulk cargo (e.g., coal or grain), such as the ports of Houston, South Louisiana, and Corpus Christi. In 2021, Houston was the top tonnage port, handling 267 million short tons of cargo, as seen in the figure below. [1]
[1] U.S. Department of Transportation, Bureau of Transportation Statistics, based upon 2021 data (most recently available), U.S. Army Corps of Engineers, Waterborne Commerce Statistics Center. Special tabulation as of November 2023.