Nimba County is a county in the north-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 six districts. Sanniquellie serves as the capital with the area of the county measuring , the largest in the nation. As of the 2008 Census, it had a population of 462,026, making it the second most populous county in Liberia.