de·mog·ra·phy 
(dĭ-mŏgrə-fē)
(dĭ-mŏgrə-fē)n.
The study of the characteristics of human populations, such as size, growth, density, distribution, and vital statistics.
[French démographie : Greek dēmos, people; see dā- in the Appendix of Indo-European roots + French -graphie, writing (from Greek -graphiā, -graphy).]
de·mogra·pher n.