Named after the State of Maryland in the United States, it joined Liberia in 1857. The most populous city in the county is Pleebo with 22,963 residents, while Maryland's County Superintendent is Sie Teba Neufville. The county is bordered by Grand Kru County to the west and River Gee County to the north. The eastern part of Maryland borders the nation of Côte d'Ivoire, separated by the Cavalla River.
Maryland was first established as a colony of the Maryland State Colonization Society 1834 but was not granted independence until 1854. The Maryland colony declared its independence from the Colonization Society but did not become part of the Republic of Liberia. It held the land along the coast between the Grand Cess and San Pedro Rivers. In 1856, the independent state of Maryland (Africa) requested military aid from Liberia in a war with the......