While the U.S. Census Bureau has only been in existence since 1903, the first population census was taken in 1790, per the requirements stated in the United States Constitution. This rather engaging website traces the history of the census through statistics, historic photographs, and other documents. On the homepage, visitors can browse through the "This Month in Census History" feature and learn some quick facts in the "Did You Know?" section. Moving along, the "Census-Then & Now" area should not be missed. Here visitors can learn about past directors of the census (such as Thomas Jefferson), read up on relevant legislation, and even look over biographies of notable census alumni. Next up is the "Geography & Mapping" section which contains an overview of how the Census maps data, coupled with a few famous maps from censuses past. One item that shouldn't be missed is the "Centers of Population" map, which shows the mean center of the population of the United States following each census. The site is rounded out by a "Through The Decades" feature, which brings visitors up to speed with the various changes made for each census.