4
The largest is Berkeley County with 1,228 square miles.
Spartanburg County in South Carolina covers approximately 819 square miles.
760 sq miles (1,968 km²).
mecklenburg
Berkeley (1,230 square miles)
819 square miles http://www.answers.com/Spartanburg+County%2C+South+Carolina?cat=travel&gwp=13
706 square miles.
Sampson County's total area is 947 square miles (2,453 square kilometers).
McDowell County in North Carolina has a total area of 446 square miles.
New Hanover County, NC is 328 sq miles (849.5 km²).
Nash County, NC has a total area of 543 square miles.
Union County with a population of about 123,000 and a total area of 640 square miles.