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ZIP codes represent groups of addresses or delivery routes. The +4 codes might narrow it down to a block, a building or single organization. ZIP+4 data is available directly from the USPS (including a file that relates it TIGER) or from third parties who have taken the USPS data and repackaged presumably with value added.
If an address is deliverable, a ZIP+4 is assigned as opposed to just a 5 digit ZIP. Some of the licensees of the data match the street and address range from the USPS with an external street centerline file to provide a geographic point representing a ZIP+4. This level of detail can be generalized back to the ZIP code and derive a ZIP point.
Some background: The USPS maintains zip codes as sets of delivery zones(5 digit) and routes(+4 digits), usually along streets with address boundaries. USPS does not maintain zip codes in any shape format. I had the issue of finding a viable source as well. I narrowed my possible solutions to the following 4 and chose to go with #3.
The +4 code is a vital part of the 11-digit DPBC (delivery point barcode), which is comprised of the 5-digit ZIP code, concatenated with the Plus-4 code, concatenated with a 2-digit delivery point, then a check digit.
A five-digit ZIP code covers an arbitrary collection of delivery points (addresses). 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. Cheap sources of current data are vendors like Semaphore Corporation.
I am searching for an address locator for ArcGIS or a (free?) batch service that will output 9-digit zip (Zip+4) from address. I have already geocoded these addresses so I have lat/long from street or point address for a good portion. I do have Esri Street Map Premium service and that allows for 9 digit zip to Lat/long but not Address to Zip+4 ...
Sep 17, 2021 at 2:14. Your easiest option to map ZIP+4 centroids would be to buy centroid files from EASI, Datasheer, GreatData, Geolytics, Geocoder, or AccuZip. You could also buy USPS ZIP+4 (non-geocoded) files and use GIS software or an API to geocode the address ranges.
I see that some organization provides zip+4 centroids . If reverse geocode is not available, I can try to use that by finding closest zip+4, however a lookup will be better. Then, there are APIs like one on zip-codes.com which takes address as input and provide zip+4 as output. Therefore some API or non-API lookup should exist which give zip+4 ...
I have a list of addresses for which I need to get the ZIP+4. I am trying to geocode following https ...
Because of this seeming inconsistency, a 5 digit ZIP Code is not as valuable as a 9 digit (or ZIP+4) code. The ZIP+4 code designates a specific area, typically a city block or grouping of houses and so is much more precise. There are 42k unique ZIP Codes currently in use and that means that the possible number of ZIP+4 codes is 420 Million.