The County Commission is the governing body of Greenbrier County. Commissioners serve in part-time positions. Greenbrier County has three commissioners; each serves a six-year term and must be a resident of the county. Their term expirations are staggered, thus, expiring different years.
The Constitution provides certain powers to the County Commission but these powers are limited to "the manner prescribed by law." This means that the County Commissions' powers must be expressly conferred by the Constitution or by Acts of the Legislature. With respect to the powers of a County Commission, the West Virginia Supreme Court of Appeals has stated that "a county court (now County Commission) possesses only such powers as are expressly conferred upon it by constitutional or statutory provisions, together with such powers as are reasonably and necessarily implied in the full and proper exercise of powers expressly conferred upon it."