U.S. Census Bureau, Geographic Areas Reference Manual (1994)
“ Each State enacts laws and regulations for establishing incorporated places. The Census Bureau designates criteria of total population size, population density, and geographic configuration for delineating CDPs. Not everyone resides in a place; in 1990, approximately 66 million people (26 percent) in the United States lived outside of any place, either in small settlements, in the open countryside, or in the densely settled fringe of large cities in areas that were built-up, but not identifiable as places. ”
