Usulután, city, southeastern El Salvador. It lies on the Pacific coastal plain at the southern foot of Usulután Volcano. The city’s name, which is Indian, means “city of the ocelots.” Usulután is a commercial centre dealing in the grain, coffee, sugarcane, fruit, and hardwood lumber produced in the adjacent hinterland. The city has only small industrial developments. Pop. (2005 est.) urban area, 45,300.