The north slope borough is the northernmost borough in Alaska. It's borough seat and largest city is utqiagvik,which is also the northernmost settlement in the United States. The north slope borough is the northernmost borough in Alaska. It's borough seat and largest city is utqiagvik,which is also the northernmost settlement in the United States. The borough was established in 1972 by an election of the majority indigenous people in the region following Congressional passage of the Alaska Native Claims Settlement Act. The Borough has first-class status and exercises the powers of planning, zoning, taxation and schools. In 1974 it adopted a Home Rule Charter, enabling it to exercise any legitimate governmental power.