Click on the Population Clock where you will find a wealth of population information including data on mobility, education, income, poverty levels, trends, immigration, fertility rates and much more under the Population Topics heading. Site also contains a link to current economic indicators. The Census website is huge. For an overview, click on the link About the Bureau. This site offers current information on labor and financial demographics including The Current Population Survey, a monthly report based on a survey of 50,000 households, and the Annual Demographic Survey which is the primary source on income and work.
Site is good for quick access to commonly used data.
FedStats Demographics Organizes the statistical reports of 70 federal agencies by subject. Good place to begin when you don't know where to start looking for demographic information. The data presented here describe the people and the economy of the US for each state and county from 1790 to 1970. Note the Historical Background essay at the top of the page which discusses the history of the U. S. Census. An experimental project of California State University, this sites provides graphical data for population, ancestry, income, and poverty levels.