San Marcos
- Country:
- Nicaragua
- Continent:
- North America
San Marcos's 2026 population is now estimated at 22,334.In 1971, the population of San Marcos was 3,491.San Marcos has grown by 111 in the last year, which represents a 0.5% annual change.These population values and projections come from Nicaragua city census-estimate series 1971-2023 via CityPopulation official attribution and World Population Review Internal Projections.