706 square miles.
mecklenburg
That's a bit iffy. Technically, Dare County in the largest county in North Carolina by area, with a total area of 1562 square miles. However, only 384 square miles of that is land. Sampson County, on the other hand, has the largest land area of any county in North Carolina, with 945 square miles of land area (out of 947 miles of total area).
McDowell County in North Carolina has a total area of 446 square miles.
It contains 951 square miles.
Nash County, NC has a total area of 543 square miles.
It covers 52,671 sq mi Source: Answers.com
Sampson County's total area is 947 square miles (2,453 square kilometers).
It has a total area of 951 square miles.
New Hanover County, NC is 328 sq miles (849.5 km²).
Union County with a population of about 123,000 and a total area of 640 square miles.
Vance County, NC is 270 sq miles (699.3 km²).