Information used by transportation planners to understand demographic and housing characteristics and worktrip travel patterns in a geographic area. Required by the U.S. Constitution, the U.S. Census is a complete enumeration of the population conducted every 10 years by the U.S. Census Bureau. Until 2000 (the last completed census), a sample of the population (about 1 in 6 households on average) received the so-called "long form" that generated detailed information about worktrips, vehicle ownership, income, and other characteristics. Census 2010 will not include a long form. The questions that were formerly included on the long form have been incorporated into the American Community Survey, which surveys a smaller sample of households (roughly 3 million per year) on a continuous basis. The Census journey-to-work data has been used by CCTA staff to estimate potential ridership on new services.