- This is a simple zipcode layer derived directly from the U.S. Census Bureau. URL:http://www.census.gov/geo/ZCTA/zctafaq.html contains fequently asked questions about this dataset. These areas are The TIGER/Line Shapefiles are an extract of selected geographic and cartographic information from the Census MAF/TIGER database. The Census MAF/TIGER database represents a seamless national file with no overlaps or gaps between parts. However, each TIGER/Line Shapefile is designed to stand alone as an independent data set or the shapefiles can be combined to cover the whole nation.
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