Demography is the statistical study of human populations. It includes the study of the size, structure, and distributions of different populations and changes in them in response to birth, migration, aging, and death. It also includes the analysis of the relationships between economic, social, cultural, and biological process influencing a population. The field of sociology draws on huge bodies of data generated by a variety of sources, including the U.S. Census Bureau. Read more about demography and how it is used in social science studies.