示例地址：城市三级联动 - citys，Github

示例：

<form method="post" action="">
    <div id="demo1">
        <select name="province"></select>
        <select name="city"></select>
        <select name="area"></select>
        <input type="text" id="input" name="input">
    </div>
    <button type="submit">提交</button>
</form>
<script>
$('#demo1').citys({"code":130109}, function(api){
    $('#input').val(api.getInfo().code);
});
</script>

自己从网上整理的省市县数据：city.zip

行政区划代码