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    <p>If you want to do this without relying on a service, then you download the <a href="http://www.census.gov/cgi-bin/geo/shapefiles/national-files" rel="noreferrer">TIGER Shapefiles</a> from the US Census.</p> <p>You look up the street you're interested in, which will have several segments. Each segment will have a start address and end address, and you interpolate along the segment to find where on the segment your house number lies.</p> <p>This will provide you with a lon/lat pair.</p> <p>Keep in mind, however, that online services employ a great deal of address checking and correction, which you'd have to duplicate as well to get good results.</p> <p>Also note that as nice as free data is, it's not perfect - the latest streets aren't in there (they might be in the data Google uses), and the streets may be off their real location by some amount due to survey inaccuracies. But for 98% of geocoding needs it works perfectly, is free, and you control everything so you're reducing dependencies in your app.</p> <p>Openstreetmaps has the aim of mapping everything in the world, though they aren't quite there it's worth keeping tabs on as they provide their data under a CC license</p> <p>However, many (most?) other countries are only mapped by gov't or services for which you need to pay a fee. If you don't need to geocode very much data, then using Google, Yahoo, or some of the other free worldwide mapping services may be enough.</p> <p>If you have to geocode a lot of data, then you will be best served by leasing map data from a major provider, such as teleatlas.</p> <p>-Adam</p>
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    1. POHow to obtain longitude and latitude for a street address programmatically (and legally)
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    1. COThis wouldn't work (for this question; in general it sounds fine for the US), as the question already states that a solution that only works for US addresses would not be an acceptable solution.
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    2. COThat's true, but originally the question did not state this - edits made by the author within 15 minutes of the original post are not considered edits. Still, I'll update the answer.
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