Lancaster County in Pennsylvania covers approximately 984 square miles.
The area of Crawford County, Michigan, is 556 sq miles (1,440 km2).
Garret County, MD: 656 sq miles (1,699 km²)
Coconino County, Arizona has an area of 18,661 sq. miles.
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.
Coos County, OR is 1,806 sq miles (4,678 km²).
Idaho County is 8,502 sq miles (22,020 km²).
Baltimore County, MD is 682 sq miles.
It is 516 sq miles.
Geauga County, OH is 408 sq miles (1,057 km²).
Geneva County, AL is 579 sq miles (1,500 km²).
Johnson County, Illinois, USA - 349 square miles.
King County, WA is 2,307 sq miles (5,975 km²).