"This report provides information on the international boundaries that the United States shares with Canada and Mexico. Included are data on land and water boundaries for the northern Canadian border and the southern Mexican border, as well as the international boundaries for the U.S. states that border these countries. Coastline figures for the continental United States, Alaska, Hawaii, the Great Lakes, and extraterritorial areas are also included. According to the U.S. Geological Survey (USGS), the length of the International Boundary line of the U.S.-Canadian border, excluding Alaska, is approximately 3,987 miles, while the length of the U.S.-Mexican border is estimated at 1,933 miles. The length of the Alaska-Canada border alone is 1,538 miles. The tables below list the 13 U.S. states that share international boundaries with Canada and the four states that share an international border with Mexico, with information from the International Boundary Commission and the U.S. Geological Survey."
CRS Report for Congress, RS21729