Flag of Sinoe County, Liberia

Sinoe is one of Liberia's 15 counties and it has 17 districts. Greenville is the county's capital. As of the 2022 Census, it had a population of 150,358, 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. There are seventeen districts in the county and it has lower tropical forests which has mid size hills composed of various valleys and water courses. Sapo National Park (180,436 ha (445,870 acres), a National protected area, Sankwehn Proposed Reserve, occupying an area of 80,348 ha (198,540 acres), a National proposed reserve and LTPC Reforestation Project with an area of 154.2 ha (381 acres) are the major plantation areas in the county. The flag is a green cross on a white background with the flag of Liberia in the top-left corner.