Northernmost point: Point Barrow, Alaska - 71°23' N 156°29' W
Easternmost point: West Quoddy Head, Maine - 44°49' N 66°57' W
Southernmost point: Ka Lae (South Cape), Hawaii - 18°55' N 155°41' W
Westernmost point: Cape Wrangell, Alaska (Attu Island) - 52°55' N 172°27' E

Geographic Center of United States: (incl. AK and HI) West of Castle Rock, South Dakota - 44°58' lat., 103°46' W long.