US Census Bureau ZIP Code Information and FAQsĪs with most public domain data, there are many commercial enhancements and services created with specific uses of the data in mind. Provides an overview of the nature of US 5-digit ZIP code geography, including the Census Bureaus ZCTA codes.
Each of datasets should be used with full knowledge of their method of creation and intended uses. Natural Features Exported: Daily Source: San Mateo County GIS Enterprise Data Available Formats Shapefile (.shp) Download Shapefile File Geodatabase (.gdb) Download FGDB AutoCAD (.dxf/.dwg) Download CAD File Google KML (.kml) Download KML File GeoJSON (.
The amended joined US ZIP code shapefile was then spatially joined to the House Districts shapefile, then to the Senate Districts shapefile, to find where zip codes were found within each district. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database. The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and cartographic information from the U.S. Contact us for more information (mention ZIP Code Demographics by Congressional District in text section). But they warn that there is no correlation between the US Postal Service ZIP Codes and the US Census Bureau-created geography of those ZIP Codes. The ZIP code fields from both the US ZIP Code shapefile and the survey were joined using a tabular join. This polygon data layer represents the 2010 TIGER/Line census 5-Digit ZIP code tabulation areas for the United States. The ZIPDP2010 shapefile is a national scope Census 2010 ZIP Code Tabulation Area shapefile with integrated Demographic Profile data. To overcome this mapping difficulty, the Census Bureau has created the ZIP Code Tabulation Area (ZCTA) by using aggregations of Census blocks. The Census Bureau has been providing ZIP Code area centroids which is probably the dataset used in the distance calculation routines. Commercial companies have created ZIP Code boundary maps by interpolating the distances between instances of ZIP Codes on the ground (probably Post Office locations). The ZIP Code "area" is not designed as an actual polygon but instead is a collection of routes (transportation network), and they change often.
The Census Bureau provides good information about the ZIP Code concept as it relates to mapping. Many commercial vendors provide ZIP Code data bases with address matching capabilities. There are many, many websites that provide on-line services to calculate distances between ZIP Codes.