New answers tagged address
SmartyStreets has a LiveAddress for Lists service that is designed to do exactly what you're looking for: You upload a list (.csv, .txt, or .xls) and a few minutes later you download the output files, which give 40+ data points, including geocode data, for each address. Our pricing is very competitive, with no minimum purchase price, and if you're a startup ...
You could try MMQGIS plugin in QGIS. It uses Google API for geo-coding and reverse geo-coding. http://plugins.qgis.org/plugins/mmqgis/ Go to MMQGIS tab> Transfer > Geocode CSV from Google. It takes CSV file as input but output geocoded file and not-found-addresses file in case of no address found on google map. Make sure your CSV is in the right format ...
You could try Nominatim from OpenStreetMap: Nominatim (from the Latin, 'by name') is a tool to search OSM data by name and address and to generate synthetic addresses of OSM points (reverse geocoding). It can be found at http://nominatim.openstreetmap.org You may need to write the wrapper functionality to allow uploading of a text file.
This may vary depending on where in the US you are, but typically as part of the development process addresses are assigned by the city/county assessor around the time the plat is recorded. I don't think it's so much a case of 'validating' as getting updated data, just like your geocoding vendor. It sounds like the post office has more recently updated their ...
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