This is a very useful tutorial for developers who are working on shipping type of project like e-commerce, we always face problem to get all county state city and zip code database, If some how we collect the data but still there is not guaranty for accuracy, So if you are working on same thing and your project need is to get user accurate location with zipcode. Then you can use google auto complete address form. But using google this feature you must have google api to authenticate request.
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How to get google api key?

Step.1: For using google map api you must have to create google api key. go to this link and click on GET A LINK button.
https://developers.google.com/maps/documentation/javascript/get-api-key
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Step.2: After that you have to login with your google account, after successful login you’ll see a new window where you need to create a project. select create a new project and click Continue button.
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Step.3: In new window you’ll able to see your google api management console where you can manage your all google api based projects. here you need to enter your api name by which you can identify your multiple api keys.
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Step.4: Finally click on Create button , a popup window will be open with api key which you can use for any google api authentication.
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Creating auto complete address form

Step.1: First add one line google map api library with your api key on your page.

<script src="https://maps.googleapis.com/maps/api/js?key=[GOOGLE_API_KEY]&libraries=places&callback=initAutocomplete" async defer></script>

Step-2: Create sample html form where in search box you need to search for location and as on select event all location parameter will be auto filled.

<div id="locationField">
      <input id="autocomplete" placeholder="Enter your address"
             onFocus="geolocate()" type="text"></input>
    </div>
 
    <table id="address">
      <tr>
        <td class="label">Street address</td>
        <td class="slimField"><input class="field" id="street_number"
              disabled="true"></input></td>
        <td class="wideField" colspan="2"><input class="field" id="route"
              disabled="true"></input></td>
      </tr>
      <tr>
        <td class="label">City</td>
        <td class="wideField" colspan="3"><input class="field" id="locality"
              disabled="true"></input></td>
      </tr>
      <tr>
        <td class="label">State</td>
        <td class="slimField"><input class="field"
              id="administrative_area_level_1" disabled="true"></input></td>
        <td class="label">Zip code</td>
        <td class="wideField"><input class="field" id="postal_code"
              disabled="true"></input></td>
      </tr>
      <tr>
        <td class="label">Country</td>
        <td class="wideField" colspan="3"><input class="field"
              id="country" disabled="true"></input></td>
      </tr>
    </table>

Step-3: Finally apply javascript to make it in action. add below javascript before body close tag on page.

<script>
      // This example displays an address form, using the autocomplete feature
      // of the Google Places API to help users fill in the information.
 
      // This example requires the Places library. Include the libraries=places
      // parameter when you first load the API. For example:
      // <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">
 
      var placeSearch, autocomplete;
      var componentForm = {
        street_number: 'short_name',
        route: 'long_name',
        locality: 'long_name',
        administrative_area_level_1: 'short_name',
        country: 'long_name',
        postal_code: 'short_name'
      };
 
      function initAutocomplete() {
        // Create the autocomplete object, restricting the search to geographical
        // location types.
        autocomplete = new google.maps.places.Autocomplete(
            /** @type {!HTMLInputElement} */(document.getElementById('autocomplete')),
            {types: ['geocode']});
 
        // When the user selects an address from the dropdown, populate the address
        // fields in the form.
        autocomplete.addListener('place_changed', fillInAddress);
      }
 
      function fillInAddress() {
        // Get the place details from the autocomplete object.
        var place = autocomplete.getPlace();
 
        for (var component in componentForm) {
          document.getElementById(component).value = '';
          document.getElementById(component).disabled = false;
        }
 
        // Get each component of the address from the place details
        // and fill the corresponding field on the form.
        for (var i = 0; i < place.address_components.length; i++) {
          var addressType = place.address_components[i].types[0];
          if (componentForm[addressType]) {
            var val = place.address_components[i][componentForm[addressType]];
            document.getElementById(addressType).value = val;
          }
        }
      }
 
      // Bias the autocomplete object to the user's geographical location,
      // as supplied by the browser's 'navigator.geolocation' object.
      function geolocate() {
        if (navigator.geolocation) {
          navigator.geolocation.getCurrentPosition(function(position) {
            var geolocation = {
              lat: position.coords.latitude,
              lng: position.coords.longitude
            };
            var circle = new google.maps.Circle({
              center: geolocation,
              radius: position.coords.accuracy
            });
            autocomplete.setBounds(circle.getBounds());
          });
        }
      }
    </script>

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