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There are 13 multi-state US Census' ZIP Code Tabulation Areas (ZCTAs): 02861, 42223, 59221, 63673, 71749, 73949, 81137, 84536, 86044, 86515, 88063, 89439 & 97635.
As others have mentioned, there are a few different ways to figure out the area covered by a ZIP Code, but ZCTAs are the easiest, and the only official version that I know of.
So your ...
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There are no duplicate ZIP Codes. There are some ZIP Codes that are multi-part polygons, but those polygons are usually adjacent.
Source: I manage/update ZIP Codes for the USPS
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There really isn't a way to tell this; since there is not a ZipCode boundary shape that is defined by the USPS. ZipCodes are defined by a bounding box of Streets delivered to by carriers from a particular distribution center. So you would need to take the USPS AIS data and extract by ZipCodes the streets that are delivered by a given Post Office, then Join ...
9
We've recently released reconstructed postcode boundaries in shapefile format for UK postcode areas, districts and sectors (reconstructed from unit postcode geocodes using Voronoi etc). They are free to use. Obviously the reconstruction is approximate and may not be suitable for all purposes.
They are available at http://www.opendoorlogistics.com/data.
7
The US Census Bureau derives approximate boundaries for ZIP codes based on the addresses contained within them, called ZIP Code Tabulation Areas (ZCTAs).
They publish relationship files that describe how their ZCTAs map to various other geographies. If you examine the ZCTA to Place relationship file you can see how they map to cities and towns. You can ...
6
You can download Code-point Open from https://www.ordnancesurvey.co.uk/business-and-government/products/code-point-open.html to get a coordinate of each postcode unit that you can join to your existing postcodes.
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OS Code-Point Open is probably the best you will get for free, and should provide you with all the data you need.
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2016 TIGER Data with PostGIS
As a special caveat, ZCTA data isn't USPS Zip Codes. It's an approximation of it. USPS Zip Codes are really horrible and not useful except to approximate. Everyone, including every governmental entity other than USPS, and (the Census for making ZCTA) ignores them entirely. If USPS wanted to a grow up a bit, they'd just convert ...
5
Ordnance Survey provides some free open data on postcodes called 'Code-Point Open'. It is a csv of the post-code with a lat long attribute. I'd suggest getting hold of this data then extracting just the post-codes you're interested in.
Information on the layer can be found here, and can be downloaded from here. Just need to fill in a form and they send ...
5
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.
You can download the 5 ...
4
UK postcodes don't cover polygons. They cover a set of individual delivery points which are not necessarily contiguous.
It is certainly possible, given the co-ordinates for these delivery points, to describe a polygon such that all the co-ordinates are within that polygon. However, such a polygon would not be a unique solution - there would be many polygons ...
4
This is probabaly not the answer you are looking for, but here it is:
You won't find them, since no one (not even the Postal Department) has Authentic Boundaries.
Pin codes in India are a way of indexing Post Offices. Multiple Post Offices can have one pin code, and one Post Office can deliver to Multiple Pincodes.
It's a Myth that there is such a thing ...
4
All of the world's postal code formats are tabulated here: http://www.grcdi.nl/gsb/world%20postal%20code%20formats.html
Some countries may precede their postal codes with a country code, as you describe in your question; and where codes contain spaces or punctuation they may be found written without, but even then there are only a few hundred possible ...
4
Try the Ordnance Survey Code Point Open. It has administrative district code and administrative ward code attributes you can join to ons codes to get the relevant information.
3
This is easy to remedy using Python. If you are in ArcGIS, you can simply use Python in a field calculator to strip the space from the field.
The code would look something like:
!post_code!.strip(" ")
which will remove the space in the postal code field. You can also do this in raw Python, but you would have to read in your csv file, make the change, ...
3
Try using Bing Geocoder, I believe they do UK, so you should be able to look up the coordinates of the zip code and in the results you will see the cities that correspond globally to that zip code...
P.S., Don't use google geocoder for UK, it doesn't work properly from personal experience.
3
Before going to WMS I would ask yourself why you need to load all 20,000 points.
Are your users able to meaningfully visualize that many points? Would you be better served displaying density of points until a specified zoom has been achieved?
After that - the other answers are your best bet. Use a WMS for that much data.
Edit for comment
You could ...
3
You can create your own from:
Codepoint Open
https://www.ordnancesurvey.co.uk/opendatadownload/products.html
Supply format: CSV
Version: 11/2013
Code-Point Open provides a precise geographic location for each
postcode unit in Great Britain. The product is a CSV file containing
postcodes, grid references, NHS® health and regional health authority
...
3
If you qualify for the OS PSMA (Public Sector Mapping Agreement) then you can get Codepoint with polygons for free. They provide an excellent service and it's delivered the very next day.
Have a google for PSMA to see if you qualify.
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I agree you are best asking this on the Open Data stack exchange. But there is this great search tool called Google, type anything like "free portugal postcode data" and first thing it throws up is this:
https://www.aggdata.com/free/portugal-postal-codes
Note it is out of date as it appears to be fixed at 2012, but it links through to the original source ...
3
Ordnance Survey Open Names (open data) gives you postcode and populated place, where populated place is a city, town, village, or some other place where people live.
For example:
SW1A 1AA -> City of Westminster
RG4 7LR -> Caversham
OX1 1AA -> Oxford
3
You (incorrectly) assume that all postal codes in Europe have the same format.
Although 4-digit postal codes are common, there are also a lot of countries that use 5 (Germany, France, Italy, etc.). Of course this is highly correlated with the size of the country in question. See Wikipedia for a list of postal code formats.
As to answer your question: I ...
3
May be too late for your needs but this is now published with a match to LAU/Degree of Urbanisation
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The FSA shapefiles are up now at http://www12.statcan.gc.ca/census-recensement/2011/geo/bound-limit/bound-limit-2011-eng.cfm I just downloaded them, now only if there was an LDU shapefile available...
Here is a picture of the LDU shapefile loaded in QGIS and zoomed into Stanley Park in Vancouver BC:
The data is available through the Platinum Postal Suite, ...
2
Mapsdata and other similar services allow you to load up Postcode and attribute data in .xls or .csv format for free and then view it on a map if that's the end product that you're looking for.
Here's a wiki description of how the postal code system works using the first or first and secondary alpha characters. It's regional specific and not city, ie PH ...
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For paid for postal codes for Spain (mapa código postal España)
Spain and Andorra (mapa código postal España) GfK GeoMarketing offers
up-to-date postcode / postal (mapa código postal), administrative
(Municipios, Comunidades Autonomas) and topographic digital maps of
Spain for use in geographic information systems (GIS) and mapping
software.
...
2
I only did a quick search but try here:
http://www.mbi-geodata.com/index.php?option=com_content&view=article&id=99&Itemid=59
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The price difference is probably due private vs public nature of the providers. I have never had an accuracy issues using government provided spatial data - census tracts etc. If price is one of your main concerns, you may wish to look into the free Canadian Postal Code centroids at http://geocoder.ca/ That being said, the red 'You haven't made it until you ...
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If PROC GMAP can do this then I would expect the operation to have a name of something like Dissolve, which in other GIS packages merges polygons based on a common attribute values.
My Google searches did not find one so I think you should ask SAS direct.
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like the previous answer this is also a commercial provider:
DDS digital data services GmbH, based in Karlsruhe, Germany offers postcode data for most of the world. Much of their data targets at geomarketing applications and thus offers even subunits of postalcodes.
http://www.ddsgeo.com/products/postal-boundaries.html
You would not get data in this level ...
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