Bago, city, western portion of the island of Negros, Philippines. Bago lies along Guimaras Strait at the mouth of the Bago River and is situated between Bacolod and its outport to the southwest, Pulupandan. Bago is located in an agricultural area that produces rice and sugarcane. Sugar milling is the principal industry. There are road connections to Bacolod and the other cities of western Negros. Pop. (2000) 141,721; (2010) 163,045.