Congressional District Boundaries 2009-2011

The following is excerpted from an online document produced by the U.S. Census Bureau pertaining to cartographic boundary files of congressional districts: "Congressional districts (CDs) are the 435 areas from which people are elected to the U.S. House of Representatives. After the apportionment of congressional seats among the states, based on census population counts, each state is responsible for establishing CDs for the purpose of electing representatives. Each CD is to be as equal in population to all other CDs in the state as practicable. The CDs in effect at the time of Census 2000 were those of the 106th Congress, whose session began in January 1999. The boundaries were identical to those reflected in the 107th CD boundary files. The CDs for the 103rd Congress (January 1993 to 1995) were the first to reflect redistricting based on the 1990 census. The 103rd CDs remained in effect through Census 2000, except where a state initiative or a court-ordered redistricting required a change. Six states redistricted for the 104th Congress (Georgia, Louisiana, Maine, Minnesota, South Carolina, and Virginia), five states redistricted for the 105th Congress (Florida, Georgia, Kentucky, Louisiana, and Texas), and three states (New York, North Carolina, and Virginia) redistricted for the 106th Congress. In North Carolina the "1998 Congressional Plan A" was used for the 1998 congressional elections. It was created in response to a court ruling which held the 1997 plan, "97 House/Senate Plan A," unconstitutional. These boundaries are reflected in the 106th CD boundary files. The Supreme Court has since reversed that lower court ruling and the 1997 plan, "97 House/Senate Plan A," (reflected in the 107th CD boundary files) was used for the 2000 North Carolina congressional elections. The 108th Congress is the first to reflect reapportionment and redistricting based on Census 2000 data."以下内容节选自美国人口普查局（U.S. Census Bureau）发布的在线文档，主题为国会选区制图边界文件： 国会选区（Congressional Districts, CDs）是选举美国众议院议员的435个行政区域。依据人口普查的人口统计数据完成国会席位在各州间的分配后，各州需负责划定本州的国会选区，以选举众议员。在实际可行的前提下，各州内各国会选区的人口数应尽可能保持均等。2000年人口普查时生效的国会选区为第106届国会的选区，该届国会于1999年1月开幕，其边界与第107届国会选区边界文件中的边界完全一致。 第103届国会（1993年1月至1995年）的国会选区是首批依据1990年人口普查结果进行选区重划的选区。第103届国会的选区适用范围持续至2000年人口普查期间，仅当州主动发起选区重划或法院下令调整选区时才会发生变更。共有6个州为第104届国会重新划定了选区：佐治亚州、路易斯安那州、缅因州、明尼苏达州、南卡罗来纳州与弗吉尼亚州；5个州为第105届国会重新划定选区：佛罗里达州、佐治亚州、肯塔基州、路易斯安那州与得克萨斯州；另有3个州——纽约州、北卡罗来纳州与弗吉尼亚州——为第106届国会重新划定了选区。 在北卡罗来纳州，1998年国会选举采用的是“1998年国会计划A”。该计划的制定源于一项法院裁决，该裁决判定1997年的“97参众两院计划A”违宪。上述选区边界收录于第106届国会选区边界文件中。此后美国联邦最高法院推翻了该下级法院的裁决，因此1997年的“97参众两院计划A”（其边界收录于第107届国会选区边界文件中）被用于2000年北卡罗来纳州的国会选举。第108届国会是首批依据2000年人口普查数据进行席位重新分配与选区重划的国会。