Grand Bassa is a county in the west-central portion of the West African nation of Liberia. One of 15 counties that comprise the first-level of administrative division in the nation, it has eight districts. Buchanan serves as the capital with the area of the county measuring 7,936 square kilometres (3,064 sq mi). As of the 2008 Census, it had a population of 224,839, making it the fifth most populous county in Liberia.