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copied!<p>You could use the Google Maps <a href="https://developers.google.com/maps/documentation/geocoding/#ReverseGeocoding" rel="nofollow">reverse geocoding API</a>. This allows you to map a lat, long pair to a set of addresses. For example:</p> <pre><code>function reverseGeoLookup(lon, lat) { //make a ajax request -- in prod just use whatever libraryyou have to provide this //probably jquery's $.get var req = new XMLHttpRequest() //put the longitude and latitude into the API query req.open("GET", "http://maps.googleapis.com/maps/api/geocode/json?latlng="+lat+","+lon+"&sensor=true", true) //this is just the result callback -- it's the function arg to $.get, essentially req.onreadystatechange = function() { if(req.readyState == 4) { //again jquery will parse for you, but we want the results field var result = JSON.parse(req.response).results //the maps API returns a list of increasingly general results //i.e. street, suburb, town, city, region, country for(var i = 0, length = result.length; i < length; i++) { //each result has an address with multiple parts (it's all in the reference) for(var j = 0; j < result[i].address_components.length; j++) { var component = result[i].address_components[j] //if the address component has postal code then write it out if(~component.types.indexOf("postal_code")) { var out = document.getElementById('output') out.innerHTML += component.long_name } } } } } //dispatch the XHR... just use jquery req.send() } </code></pre> <p>I put this example into a js fiddle too, <a href="http://jsfiddle.net/ef72Q/" rel="nofollow">here</a>.</p> <p>Hope this helps.</p>

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