It depends on which San Antonio you're talking about:
Argentina
San Antonio, Jujuy, Jujuy Province
San Antonio de Areco
San Antonio Oeste
San Antonio de los Cobres
San Antonio, Misiones
Cape San Antonio, Argentina
Chile
San Antonio, Chile
San Antonio Province
Cuba
San Antonio de los Baños
San Antonio del Sur
Cape San Antonio, Cuba
Guatemala
San Antonio Aguas Calientes
San Antonio Huista
San Antonio Ilotenango
San Antonio La Paz
San Antonio Palopó
San Antonio Sacatepéquez
San Antonio Suchitepéquez
Mexico
San Antonio, San Luis Potosí
San Antonio Acutla, Oaxaca
San Antonio de la Cal, Oaxaca
San Antonio Huitepec, Oaxaca
San Antonio la Isla
San Antonio, Baja California Sur
Unión de San Antonio, Jalisco
Philippines
San Antonio, Northern Samar
San Antonio, Nueva Ecija
San Antonio, Quezon
San Antonio, Zambales
Peru
San Antonio District, Cañete
San Antonio District, Huarochirí
San Antonio River (Peru)
California
Lake San Antonio in Monterey County and San Luis Obispo County
Mount San Antonio of the San Gabriel Mountains, the highest point in Los Angeles County
San Antonio, California, an unincorporated community in Marin County
San Antonio, Oakland, California, a neighborhood in Alameda County
San Antonio Creek (Marin County, California), an eastward-flowing stream in Marin County and Sonoma County
San Antonio Dam in Monterey County
San Antonio Reservoir (Alameda County)
San Antonio River (California) in Monterey County
San Antonio Valley, California in Santa Clara County
San Antonio Valley AVA, a wine region in Monterey County
Other US Locations
Barrio San Antonio, a neighborhood of Tucson, Arizona
San Antonio, Florida
San Antonio, New Mexico
San Antonio, Texas San Antonio River, Texas, originating in San Antonio San Antonio Springs, springs that provide a large portion of the water for the river
Uruguay
San Antonio, Canelones
San Antonio, Salto
Elsewhere
San Antonio Cayo, Cayo District, Belize
Laguna San Antonio, a lake in Bolivia
Santo Antônio do Sudoeste, Paraná State, Brazil
San Antonio Province, Chile
San Antonio, Tolima, Colombia, a municipality
San Antonio, San Miguel, El Salvador
San Antonio de Cortés, Cortés Department, Honduras
San Antonio, Saipan, Mariana Islands
Cape San Antonio, Spain
Sant Antoni de Portmany, Ibiza, Spain
San Antonio del Táchira, Venezuela
