"Files provide Census 2000 data summaries for two types of state legislative district (SLD) boundaries: upper chamber and lower chamber. Statistics on 100-percent and sample population and housing subjects are presented for all states, the District of Columbia, and Puerto Rico. For Nebraska, which has a unicameral legislature, data are presented as upper chamber only. For the District of Columbia, data also are presented as upper chamber only. Geographic areas within SLD are county, county subdivision, place, state portion of American Indian and Alaska Native area, and Hawaiian home land. States provided updated boundaries in 2005/2006 as part of Phase 1 of the 2010 Census Redistricting Data Program. Please note that the state legislative districts shown in these files reflect the redistricting that occured following Census 2000 and therefore differ from those shown in the Census 2000 Redistricting Data (Public Law 94-171) Summary File. The 100-Percent File contains data collected for all people and housing units, as reflected by the Census 2000 short-form questionnaire (PDF - 424 KB) covers the same basic subject characteristics as Summary File 1. The Sample File contains data from a sample of approximately 19 million housing units (about 1 in 6 households) that received the Census 2000 long-form questionnaire (PDF - 627KB) covers the same detailed subject characteristics as Summary File 3"--U.S. Census Bureau Web site.