The U.S. Census Bureau provides the 50 states, the District of Columbia, and Puerto Rico with population counts to use in their redrawing of congressional and state legislative district boundaries—a process known as “redistricting.”
While the states are responsible for legislative redistricting, the Census Bureau provides population counts for the geographic areas the states need.
As a supplement to the America Counts: Stories Behind the Numbers article titled, "Improved Race and Ethnicity Measures Reveal U.S. Population is Much More Multiracial," Tables 1-5 provide race and ethnicity statistics for the nation (50 states and the District of Columbia) from the 2020 Census Redistricting Data (P.L. 94-171).
Decennial Census P.L. 94-171 Redistricting Data Summary Files
Includes the official data, documentation, and support materials to assist in accessing P.L. 94-171 Redistricting Data.