North Slope Borough, Alaska
The North Slope Borough is the northernmost borough in the US state of Alaska and, thus, the northernmost county or equivalent of the United States as a whole. As of the 2020 census, the population was 11,031. The borough seat and largest city, comprising nearly half of the borough’s population, is Utqiaġvik (known as Barrow from 1901 to 2016), the northernmost settlement in the United States.