Historical Demography Data

I am pleased to see that, for those interested in historical demography, there appears to be no small number of organizations and websites with various levels of population statistics throughout the world.  For those interested in general trends the world over, there is the Populations Statistics website of Jan Lahmeyer.  This site breaks down the population levels of various nations throughout the world by administrative division and municipalities, along with some general data about individuals countries and, in the case of the US, individual states.  I'll be reviewing and linking to a number of other historical demography sites in the days to come.