In the 1734 map of the Philippine islands by Pedro Murillo Velarde, the places labeled "Vinuangan", "Polo" (currently Valenzuela), and "Maycauayan" were indicated separately and proximate to one another.Upon the Governor's untimely death at the hands of the British during the Seven Years' War, the creation and establishment of the town was made and attended by the Alcalde Mayor of the province, Don Francisco Morales y Mozabe, the Provincial Minister, S. Gregorio, Rev.By resolution of 1975 Municipal Council, the area was made into a barangay and named Nuestra Señora de Salambao in honor of one of its patron saints.[7] Obando is bordered by Valenzuela to the east, Navotas and Malabon to the south, Bulakan to the north, and the waters of Manila Bay to the west.Barangays Binuangan (ancient "Binwangan" mentioned on the Laguna Copperplate Inscription, which is the oldest written document of Philippines inscribed in Indianized script, dating back to 900 CE) and Salambao are located along the Paliwas River, and can be reached only by means of motorized boats.The average monthly income of a household is ₱9,000.00, slightly below the ₱9,540.00 minimum for a family of 6 threshold set by Department of Social Welfare and Development.