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I'm not based in the USA, but I've only heard good things about the TIGER geocoder, and it seems to be the best complement with PostGIS. To quote that link: The goal of this project is to build a fully functional geocoder that can process an arbitrary United States address string and using normalized TIGER census data, produce a point geometry and rating ...


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For geocoding (converting an address to a lonlat), you might consider Nominatim, which uses OpenStreetMap data and runs on PostGIS. I've gotten pretty good accuracy out of it, but it varies depending on region. It can also do reverse geocoding (lonlat -> address).



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