Notes:

Major ports are ports with a commodity tonnage total of 10 million or more, in 2012.

Airports with at least 750,000 enplanements or more, in 2013, are included on the map.

State capitals and cities of 250,000 population or larger, in 2010, are shown.

Source:

U.S. Department of Transportation, Bureau of Transportation Statistics, National Transportation Atlas Database 2014.

U.S. Geological Survey, 200509, USGS Small-scale Dataset - Grayscale North America Shaded Relief - 1-Kilometer Resolution 200509 GeoTIFF: U.S. Geological Survey, Reston, VA.