Argentina
- San Marcos Sierras, common in the province of Córdoba (department of Cruz del Eje)
- San Marcos South, municipality in the province of Córdoba (department of Unión)
Colombia
- San Marcos, common in Department of Sucre
Costa Rica
- San Marcos, district of the capital of the canton of Tarrazú
El Salvador
- San Marcos, common
Guatemala
- San Marcos Department, department
- San Marcos, municipality and capital of the homonymous department
- San Marcos la Laguna, common in the Department of Sololá
Honduras
- San Marcos, common in the Department of Ocotepeque
- San Marcos, municipality in the Department of Santa Bárbara
- San Marcos de Caiquín, common in the Department of Lempira
- San Marcos de Colón, common in the Department of Choluteca
- San Marcos de la Sierra, municipality in the Department of Intibucá
Mexico
- San Marcos, city located in the State of Guerrero
- San Marcos, city located in the State of Jalisco
- San Marcos Arteaga, city located in the State of Oxaca
Nicaragua
- San Marcos, common in the Department of Carazo
Spain
- Cuevas de San Marcos - municipality located in the autonomous community ofAndalusia
United States of America
- San Marcos, city of Texas
- San Marcos, city of California