intl-tel-input/examples/partials/countrySync.html

A JavaScript plugin for entering and validating international telephone numbers

<div class="form-item">
  <label>Telephone number</label>
  <input id="phone" type="tel">
</div>

<div class="form-item">
  <label>Address</label>
  <input type="text" placeholder="House name/number">
  <input type="text" placeholder="City">
  <input type="text" placeholder="State">
  <input type="text" placeholder="Zip code">
  <select id="address-country"></select>
</div>