The analysis of population levels in Latin America plays an important role in the regional historiography. The estimated series appeared until now offers huge discrepancies, therefore, we believe essential to provide homogeneous series for the 19th and the 20th centuries. In our work we shed new light on this issue, from an exhaustive study of the existing Latin American historical sources for the region. To do that, we offer series of population for 21 countries of Latin America (Argentina, Brazil, Bolivia, Chile, Colombia, Costa Rica, Cuba, Guatemala, Ecuador, Haiti, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Dominican Republic, Uruguay and Venezuela) from own sources (Population Census), and other demographic complementary works. From all the wide range of existing databases (Mitchell, Maddison, MOXLAD and ECLAC), the authors have chosen to base its reconstruction of the data, on the series offered by ECLAC, which derive from the work of CELADE. Along with a detailed explanation of the data collection, we also provide an analysis of the discrepancies and the accuracy of sources. It concludes with an appendix with the data series.