The most Eastern , Western and Northern US state is Alaska .
However , since it is in the Eastern Hemisphere , being on the opposite side of the 180° longitude line as the contiguous 48 states , it can also be considered one of the easternmost points of the country ( a second Aleutian Island , Semisopochnoi Island at 179°46′E , is the easternmost location in the United States by this definition ) .In the chain of the Aleuts , the next island to the west of Attu are the Russian Commander Islands , away ( and on the other side of the International Date Line ) .