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And just over 100 "unique" ZIP codes are reserved for schools and businesses at a single location. This polygon shapefile represents boundaries with the first three digits of a ZIP Code. Small towns often don't have street delivery everything for a ZIP code might go to post office boxes at one location. Postal Service five-digit or three-digit. Since all addresses for a ZIP will be served by a single post office, it's tempting to start with that office's city boundary as the encompassing border for all ZIP codes served by that office, but exceptions occur: for example, a post office will serve ZIP codes outside the city, such as in unincorporated towns. A ZIP Code tabulation area (ZCTA) is a statistical geographic entity that approximates the delivery area for a U.S.
US ZIP CODE SHAPEFILE HOW TO
It might mean computing the minimum rectangular bounding box enclosing all the addresses in a ZIP, or using a Graham scan to compute a "tighter" polygon, or using Lloyd's algorithm to polygonize a map, but how to choose the "best" boundary isn't always clear as shown in these 3 different boundaries for 5 points. OSM2GIS - Simple tool developed by User:Arnaud974, one shapefile each with all tags for points, lines and polygons Boundaries Map offers worldwide shapefiles of all administrative boundaries. ZIP Code Tabulation Areas (ZCTAs) are approximate area representations of U.S. Postal Service (USPS) ZIP Code service areas that the Census Bureau creates. OSMaxx extract service, export to Shapefile (and GeoPackage etc.) based on bounding box for whole world with data about a day old. 2010 Census 5-Digit ZIP Code Tabulation Area (ZCTA5) State-based.
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The MTDB represents a seamless national file with no overlaps or gaps between. Census Bureaus Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). Addresses along the route are visited in a specific order, however there is no guarantee what path is taken by the mail carrier between two points along the route, so attempts at plotting routes as lines (or plotting all routes in a ZIP as a collection of lines) can't always be accurate.īecause ZIP codes are collections of points, the concept of "boundary" is ambiguous. ZIP Code Tabulation Areas (ZCTAs) are approximate area representations of U.S. The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S.
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Cheap sources of current data are vendors like Semaphore Corporation.Īddresses within a ZIP code are assigned to numbered delivery routes. The USPS is the sole determiner of what ZIP code is assigned to what address, so they are the best source of current and correct data, which changes monthly. A five-digit ZIP code covers an arbitrary collection of delivery points (addresses).