Redistricting occurs at least every 10 years, after new Census data determine which states have gained and lost residents. Here's a primer about the process and its consequences.
As a result of the 2010 Census, eight states will gain congressional seats: Arizona, Florida, Georgia, Nevada, South Carolina, Texas, Utah, and Washington.
Ten states will lose congressional seats: Illinois, Iowa, Louisiana, Massachusetts, Michigan, Missouri, New Jersey, New York, Ohio, and Pennsylvania.
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