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.

CaSIL modified this data's spatial extent and attributes for it's use. Please see use constraints for acknowledgement required by the U.S. Census Bureau.

REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.

Zip code tabulation areas are designed to approximate the location of U.S. Postal zip codes. ZCTAs are approximations of mailing ZIP Codes and should not be confused with them. There multiple common reasons why someone's ZIP Code may not match the ZCTA code, and these need to be considered. Based on the January 2000 list of ZIP Codes from the USPS's Delivery Type File, the ZCTA delineation process excluded 10,068 ZIP Codes in the United States and Puerto Rico. In order for others to use the information in the Census MAF/TIGER database in a geographic information system (GIS) or for other geographic applications, the Census Bureau releases to the public extracts of the database in the form of TIGER/Line Shapefiles.

This dataset has been modified by the California Spatial Information Library URL:http://gis.ca.gov to fit within it's framework specifications.

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Projected: Lambert Conformal Conic North American Datum of 1983

Geographic: GCS_North_American_1983