Below I split all the details of formatted address like City, State, Country and Zip code.
So when you start typing your street name and select any option then street name write over street field, city name write over city field and all other fields like state, country and zip code will fill automatically.
Using Google APIs.
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<script type="text/javascript"
src="http://maps.googleapis.com/maps/api/js?sensor=false&libraries=places"></script>
<script type="text/javascript">
google.maps.event.addDomListener(window, 'load', function() {
var places = new google.maps.places.Autocomplete(document
.getElementById('txtPlaces'));
google.maps.event.addListener(places, 'place_changed', function() {
var place = places.getPlace();
var address = place.formatted_address;
var value = address.split(",");
count=value.length;
country=value[count-1];
state=value[count-2];
city=value[count-3];
var z=state.split(" ");
document.getElementById("selCountry").text = country;
var i =z.length;
document.getElementById("pstate").value = z[1];
if(i>2)
document.getElementById("pzcode").value = z[2];
document.getElementById("pCity").value = city;
var latitude = place.geometry.location.lat();
var longitude = place.geometry.location.lng();
var mesg = address;
document.getElementById("txtPlaces").value = mesg;
var lati = latitude;
document.getElementById("plati").value = lati;
var longi = longitude;
document.getElementById("plongi").value = longi;
});
});