2010 Census Redistricting Data Decennial census data are used
for geographically defining state legislative districts, a
“redistricting” process that begins in 2011. County level data
by state is available through the Census Bureau’s interactive
map tool. For more local area data about your state, visit
American FactFinder. The census data allow state officials to
realign congressional and state legislative districts in their
states, taking into account population shifts since the last
census and assuring equal representation for their constituents
in compliance with the “one-person, one-vote” principle of the
1965 Voting Rights Act.