There are a number of different interpretations for "easternmost" and "westernmost"; see below for full treatment.
This is a list of points in the United States that are farther north, south, east or west than any other location in the country. Also included are extreme points in elevation, extreme distances and other points of peculiar geographic interest.
Extreme points in the 50 states: Point Barrow, Ka Lae, Sail Rock, Peaked IslandExtreme points in the contiguous 48 states: Northwest Angle, Ballast Key, Sail Rock, Bodelteh IslandsExtreme points of the U.S. on the North American continent: Point Barrow, Cape Sable, West Quoddy Head, Cape Prince of WalesExtreme points in all U.S. territory: Point Barrow, Rose Atoll, Wake Island, Peaked Island (red dots); Point Udall, Guam, and Point Udall, USVI are shown as green dots. The International Date Line is shown in yellow.