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HTML 

              
                <form>
    <input type="text" name="zip" class="zip" value="" placeholder="例：1234567">
    
    <button type="button" class="ajaxzip3" href="#">郵便番号から住所を取得</button>
    
    <select name="pref" class="pref">
        <option value="" selected="">都道府県</option>
        <option value="北海道">北海道</option>
        <option value="青森県">青森県</option>
        <option value="岩手県">岩手県</option>
        <option value="宮城県">宮城県</option>
        <option value="秋田県">秋田県</option>
        <option value="山形県">山形県</option>
        <option value="福島県">福島県</option>
        <option value="茨城県">茨城県</option>
        <option value="栃木県">栃木県</option>
        <option value="群馬県">群馬県</option>
        <option value="埼玉県">埼玉県</option>
        <option value="千葉県">千葉県</option>
        <option value="東京都">東京都</option>
        <option value="神奈川県">神奈川県</option>
        <option value="新潟県">新潟県</option>
        <option value="富山県">富山県</option>
        <option value="石川県">石川県</option>
        <option value="福井県">福井県</option>
        <option value="山梨県">山梨県</option>
        <option value="長野県">長野県</option>
        <option value="岐阜県">岐阜県</option>
        <option value="静岡県">静岡県</option>
        <option value="愛知県">愛知県</option>
        <option value="三重県">三重県</option>
        <option value="滋賀県">滋賀県</option>
        <option value="京都府">京都府</option>
        <option value="大阪府">大阪府</option>
        <option value="兵庫県">兵庫県</option>
        <option value="奈良県">奈良県</option>
        <option value="和歌山県">和歌山県</option>
        <option value="鳥取県">鳥取県</option>
        <option value="島根県">島根県</option>
        <option value="岡山県">岡山県</option>
        <option value="広島県">広島県</option>
        <option value="山口県">山口県</option>
        <option value="徳島県">徳島県</option>
        <option value="香川県">香川県</option>
        <option value="愛媛県">愛媛県</option>
        <option value="高知県">高知県</option>
        <option value="福岡県">福岡県</option>
        <option value="佐賀県">佐賀県</option>
        <option value="長崎県">長崎県</option>
        <option value="熊本県">熊本県</option>
        <option value="大分県">大分県</option>
        <option value="宮崎県">宮崎県</option>
        <option value="鹿児島県">鹿児島県</option>
        <option value="沖縄県">沖縄県</option>
    </select>
    
    <p>市区町村</p>
    <input type="text" name="addr1" class="addr1" value="">
    
    <p>町名</p>
    <input type="text" name="addr2" class="addr2" value="">
    
    <p>番地</p>
    <input type="text" name="addr3" class="addr3" value="">
    
    <p>マンション名・部屋番号</p>
    <input type="text" name="addr4" class="addr4" value="">
</form>
!

CSS 

              
                form {
    width: 400px;
    margin: 40px auto;
    padding: 28px;
    border: 1px solid #ffffff;
    border-radius: 5px;
    background-color: transparent;
    box-shadow: 2px 2px 5px 0px rgba(200,200,200,1);
    
    p {
        margin: 0 0 5px 0;
        color: #555555;
        font-size: .85em;
    }
    
    input {
        display: block;
        width: 100%;
        margin: 0 0 20px 0;
        padding: 5px;
        border-radius: 5px;
        border: 1px solid #a8aabc;
    }
    
    .ajaxzip3 {
        display: inline-block;
        width: 150px;
        margin: 0 0 20px 26px;
        padding: 8px;
        text-align: center;
        text-decoration: none;
        color: #ffffff;
        font-size: .7em;
        border: 0;
        border-radius: 5px;
        background-color: #a8aabc;
        box-shadow: none;
        cursor: pointer;
        
    }
    
    .zip {
        display: inline-block;
        width: 47.5%;
        margin: 0 0 20px 0;
    }
    
    .pref {
        display: inline-block;
        width: 50%;
        margin: 0 0 20px 0;
        padding: 5px;
        border-radius: 5px;
        border: 1px solid #a8aabc;
            
    }
    
     .addr4 {
         margin: 0;
    }
    
}
!

JS 

              
                $('.ajaxzip3').on('click', function(){
    AjaxZip3.zip2addr('zip','','pref','addr1','addr2', 'addr3');

    //成功時に実行する処理
    AjaxZip3.onSuccess = function() {
        $('.addr3').focus();
    };
    
    //失敗時に実行する処理
    AjaxZip3.onFailure = function() {
        alert('郵便番号に該当する住所が見つかりません');
    };
    
    return false;

});
!
999px

Console