Alderson, a town in the US State of West Virginia, is split geographically by the Greenbrier River, with portions in both Greenbrier and Monroe Counties. Although split physically by the river, the town functions as one entity, including that of town government. The population was 1,091 at the 2000 census.
The Alexander McVeigh Miller House in Greenbrier County is listed on the National Register of Historic Places. Sunset Hill is listed in Monroe County. The Alderson Bridge and Alderson Historic District are located in both counties.
According to the United States Census Bureau, the town has a total area of 1.0 square miles (2.5 km²). 0.9 square miles (2.3 km²) of it is land and 0.1 square miles (0.2 km²) of it (6.25%) is water.