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I searched the USPS web site, queried, did a general Google search and turned up nothing. I tried querying GNIS for feature type post office, but the data is listed as "entered 1993" for most entries, and just looking at some in my general vicinity I can find now-closed post-offices not listed as "historical", currently open post offices listed as "historical", and open post offices with locations listed as unknown. All in all, not a very good approach.

While a national listing would be ideal, a source for just New Mexico would suffice (at least for now.)

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Would querying open street map do for your purposes? – BradHards Feb 9 '13 at 6:10
The results from the OSM results from the nominatum and GeoNames both appear to have their origins in GNIS, sharing it's faults – Llaves Feb 9 '13 at 15:56

One possible data source is the POI Factory. They have a post offices layer (I don't know the quality of the data) that purports to have

"22,411 POI locations in the United States."

Depending on your planned use, you should definitely read their Terms of Use.

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this also appears to be a re-packaging of GNIS data – Llaves Feb 10 '13 at 4:47

See the link below the descriptor from UNC GIS data finder

"FSA Postal Centroids Shapefile 1:50,000 2002 postal codes, forward sortation areas, three-character postal codes, locations, post offices, zip codes"

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It looks like you intended to include a link, but it's not there. – Llaves Feb 10 '13 at 4:47
If you follow that link to the next screen of description, it's Canadian post offices. Also, the file is restricted to the UNC community, licensed from ESRI. However, the list includes another file with USPS data, also restricted to UNC community, but also from the ESRI data sources, so perhaps it's buried on an ESRI DVD I have. Thanks. – Llaves Feb 16 '13 at 6:02

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