20 Largest Counties in the US by Area

2. North Slope Borough, Alaska

Total Land Area (in square miles): 88,823.63

The North Slope Borough of Alaska ranks 2nd among the largest counties in the US by area. The county’s population experienced a slight decline of -3.9%, from 10,811 in 2022 to 10,603 in 2023, highlighting shifting demographics. Of the total population of the North Slope Borough, 73.4% are employed and 14.2% have attained higher education.