The Census Bureau serves as the leading source of quality data about the United States' people and economy. The U.S. Census counts every resident in the United States. It is mandated by Article I, Section 2 of the Constitution and takes place every 10 years. The data collected by the decennial census determine the number of seats each state has in the U.S. House of Representatives and is also used to distribute billions in federal funds to local communities. Questions include name, gender, race, ethnicity and whether respondent sometimes live somewhere else. The head of household answers how many people live in the residence and whether it is a house, apartment or mobile home. This collection include U.S. census for the year 1990, 2000, and 2010.