Redistricting (Public Law 94-171)
Public Law 94-171, enacted in 1975, directs the United States Census Bureau to make special preparations to provide redistricting data needed by the 50 states. It specifies that within one year following the Census Day (i.e., for Census 2000 by April 1, 2001), the Census Bureau must send to the govenor and legislature in each state the data they need to redraw districts for the United States Congress and state legislatures. The National File provides data in a hierarchical sequence down to the block level (state, county, voting district/remainder, county subdivision, place/remainder, census tract, block group, block). The file contains four tables: (1) a count of all persons by race (Table PL1); (2) a count of Hispanic or Latino and a count of not Hispanic or Latino (Table PL2); (3) a count of the population 18 years and older by race (Table PL3); a count of Hispanic or Latino and a count of not Hispanic or Latino by race for the population 18 years and older (Table PL4).