Sinoe is one of Liberia's 15 counties and it has 17 districts. Greenville is the county's capital. As of the 2008 Census, it had a population of 104,932, making it one of the least populous counties in Liberia.Sinoe has the third-largest area of all Liberia's counties; it has the second least-dense population after Gbarpolu County. The County was originally a colony in the name Mississippi-in-Africa, under auspices of a chapter of the American Colonization Society as it was created with slaves from Mississippi to Liberia.