Tijuana is in Mexico.
Tijuana ( [ tiːˈwɑːnə ] ; [ tiˈxwana ] ) is the largest city in Baja California and on the Baja California Peninsula and center of the Tijuana metropolitan area , part of the international San Diego -- Tijuana metropolitan area . Currently one of the fastest growing metropolitan areas in Mexico , Tijuana maintains global city status . Tijuana is the 45th largest city in the Americas and is the westernmost city in Mexico . The Tijuana metropolitan area , and in Spanish the Zona Metropolitana de Tijuana , is located on the Pacific Ocean in Mexico . According to the 2005 census , the Tijuana metropolitan area was the sixth-largest in Mexico , with a population of 1,483,992 .