Place in Bissau Autonomous Sector, Guinea-Bissau Bissau Mercado de Bandim, Bissau Flag Seal Bissau Location of Bissau in Guinea-Bissau Show map of Guinea-Bissau Bissau Bissau (Africa) Show map of Africa Coordinates: 11°51′N 15°34′W﻿ / ﻿11.850°N 15.567°W﻿ / 11.850; -15.567Coordinates: 11°51′N 15°34′W﻿ / ﻿11.850°N 15.567°W﻿ / 11.850; -15.567 Country Guinea-Bissau Region Bissau Autonomous Sector Founded 1687 Area • Total 77.5 km2 (29.9 sq mi) Elevation 0 m (0 ft) Population (2015 census) • Total 492,004 • Density 5,009/km2 (12,974/sq mi) ISO 3166 code GW-BS Climate Aw