Extreme Points of the United States (50 States): Distance1 Extreme pointLatitudeLongitudemi.km Northernmost point: Point Barrow, Alaska71°23' N156°29' W2,5074,034 Easternmost point: West Quoddy Head, Maine44°49' N66°57' W1,7882,997 Southernmost point: Ka Lae (South Cape), Hawaii18°55' N155°41' W3,4635,573 Westernmost point: Cape Wrangell, Alaska (Attu Island)52°55' N172°27' E3,6255,833 1. From geographic center of United States (incl. Alaska and Hawaii), west of Castle Rock, S.D., 44°58' lat., 103°46' W long. If measured from the prime meridian in Greenwich, England, Cape Wrangell, Attu Island, Alaska, would be the easternmost point.