The Center for TOD created the first national database containing information about every fixed-guideway transit system and station in the U.S., the half-mile radius around all 3,971 stations, and the people who live in these transit zones. The information was integrated in GIS format with data from the 2000 U.S. Census and other sources to create a powerful database that makes it possible to find out who lives near transit, their income, travel behavior, car ownership and household type, as well as information about the density, land uses, block size and distance to the central business district.