U.S. Census Release of TIGER/Line Shapefiles
TIGER/Line Shapefiles are extracts containing selected geographic and cartographic information from the Census Bureau’s MAF/TIGER? (Master Address File / Topologically Integrated Geographic Encoding and Referencing) database. The MAF/TIGER database was developed at the Census Bureau to support a variety of geographic programs and operations including functions such as mapping, geocoding, and geographic reference files that are used in decennial and economic censuses and sample survey programs. Spatial data for geographic features such as roads, railroads, rivers, and lakes, as well as legal and statistical geographic areas are included in the product. Other information about these features, such as the name, the type of feature, address ranges, and the geographic relationship to other features, also are included. The TIGER/Line Shapefiles are made available to the public for no charge and are typically used to provide the digital map base for a Geographic Information System or for mapping software.
The 2008 TIGER/Line Shapefiles contain current geographic areas (boundaries of governmental units as of January 1, 2008), Census 2000 vintage geography, and Economic Census geography. The shapefiles also contain some additional feature updates reported in the Boundary and Annexation Survey (BAS). All counties have now been realigned as a result of the MAF/TIGER Accuracy Improvement Project (MTAIP) and are included in the 2008 TIGER/Line Shapefiles. For more information about the MTAIP please refer to the 2008 TIGER/Line Shapefile Technical Documentation available in [pdf] or Text.