Census 2000 Gateway (U.S. Census)
Florida County Population Data (Florida EDR)
InfoNation (UN) - Allows you to view and compare the most up-to-date statistical data for the Member States of the United Nations.
International Data Base (U.S. Census) - Includes data for individual countries
National Population Projections (U.S. Census)
Population Estimates (U.S. Census) - National, state, county, place & county subdivision, metropolitan area
State Population Projections (U.S. Census)