9 Largest Counties in the US by Area

6. Matanuska-Susitna Borough, Alaska

Total Land Area (in square miles): 24,706.97

With a population of 115,239 people, a population density of 4.3 people per square mile, and a land area of nearly 24,707 square miles, the Matanuska-Susitna Borough of Alaska is the 6th largest county by area in the US. In this county, 56.3% of the residents are employed, and the employment sectors vary widely. Construction and retail trade sectors lead the way, while education, healthcare, transportation, and public administration also contribute to shaping the borough’s economic landscape.