Lancaster County in Pennsylvania covers approximately 984 square miles.
Brown County, Wisconsin covers approximately 615 square miles.
The area of Crawford County, Michigan, is 556 sq miles (1,440 km2).
Coconino County, Arizona has an area of 18,661 sq. miles.
Garret County, MD: 656 sq miles (1,699 km²)
Martin County, FL is 753 sq miles (1,950 km²).
King County, Washington, USA - 2,307 sq miles.
Adair County, KY is 412 sq miles (1,067 km²)
Harney County, OR is 10,226 sq miles (26,485 km²).
Oglethorpe County, Georgia, USA - 442 square miles.
Baltimore County, MD is 682 sq miles.
Idaho County is 8,502 sq miles (22,020 km²).
Coos County, OR is 1,806 sq miles (4,678 km²).
It is 516 sq miles.
Geauga County, OH is 408 sq miles (1,057 km²).
King County, WA is 2,307 sq miles (5,975 km²).
Johnson County, Illinois, USA - 349 square miles.
Tarrant County, TX is 897 sq miles (2,323 km²).