Monclova's 2026 population is now estimated at 391,120. In 1950, the population of Monclova was 19,156. Monclova has grown by 5,165 in the last year, which represents a 1.34% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Monclova, which typically includes Monclova's population in addition to adjacent suburban areas.