Census Data Research Online is a private research organization which analyzes and catalogs public demographic data for the purpose of aiding individuals in researching name-based trends and genealogy. They provide this site as a free tool to make a portion of this data publicly available.
They are not affiliated with, endorsed by, or connected with the U.S. Census Bureau or any other government agency in any way. Although a full U.S. census is conducted only once every ten years, this information is updated yearly using projected population growth estimates, housing density data, and other factors. This site allows users to perform searches based on first and last name combinations representing almost 100% of the population of the United States. The actual data displayed in the results depends on the current demographics available for public use at the time of the search. You can enter the name in the search box located at the homepage, or you can browse it by last name using the index available also there. 
