As a result of population changes between the 1990 and 2000 censuses, 8 states gained members and 10 states had fewer members in the House of Representatives. The regional patterns of change in congressional representation between 1990 and 2000 reflect the Nation’s continuing shift in population from the Northeast and Midwest to the South and West.
Based on the Census 2000 apportionment, each member of the U.S. House of Representatives represented an average population of 646,952.
Apportionment Tables: (Source of items 3 and 4: 2000 Census of Population and Housing, "Population and Housing Unit Counts," PHC-3-1)