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For each year, there is an accompanying webpage. Select "Zip Code Tabulation Areas", and you will see a download link for a file. For example, the 2013 file is named "2013_Gaz_zcta_national.zip", which unzips into a tab-separated file. The schema for this file contains a zip code and a latitude, longitude pair, presumably the centroid of the ...
As mentioned earlier, there are a few ZIP Codes that deliver across state lines, and there are a few ZIP/sectors that cross county lines. There are 153 ZIP Codes in more than one state. There are 9,000 ZIP Codes in more than one county. There were 11,331 (out of the total 857,400) ZIP/sectors that were split by county.
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.
There's no strict algorithmic relationship between latitude and longitude and zip code - they're all custom areas generated by the postal service. You need access to a dataset that codes polygons / polygon centroids by zip code. 1) Complex. Traditionally, this task (coupled with address lookup) is termed 'Geocoding'.
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.
Zip Code Tabulation Areas (ZCTA) are a US Census product derived from the Zipcodes defined by the USPS which, as a federal entity, may cross state and other administrative boundaries. They are semi-fuzzy boundaries based on the logistical delivery of mail and are subject to changes between censuses. Per the census mandate, census data must ...
Is anyone aware of an open source exhaustive list of geocoded (WGS84 lat long) zip codes for the Republic of Ireland. You might try asking on the Open Data Stackexchange. I just looked and didn't see any existing questions that matched. To my knowledge, ZIP codes are unique to the USA. By clicking “Post Your Answer”, you agree to our terms ...
2. Using a join (if MM) does have that function is what you want to do. Where zip code 73701 is in your csv that is joined to the polygon with 73701 in its atributes. These are then called primary and foreign keys. You can then change the symbology of the polygon with the value of any field in your foreign table.
Get a zip-code boundary layer and run Polygon Neighbors. Review How Polygon Neighbors Works and Up-To-Date Zip-Code Boundaries. Picture below might be different than your ArcMap looks, but the buttons and procedure should be the same. Perhaps this is an open-source solution.
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. The USPS data does not ...