Census

Definition from Nolo’s Plain-English Law Dictionary

An official count of the number of people living in a certain area, such as a district, city, county, state, or nation. The U.S. Constitution requires the federal government to perform a national census every ten years. The census includes information about the respondents' sex, age, family, and social and economic status. Its results are publicly available.

Definition provided by Nolo’s Plain-English Law Dictionary.