<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<form class="form-horizontal">
<fieldset>
<legend>Form Name</legend>
<div class="row">
<div class="form-group">
<label class="col-md-4 control-label" for="direccion">Dirección</label>
<div class="col-md-4">
<input id="direccion" name="direccion" type="text" placeholder="" class="form-control input-md">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="numero">Número</label>
<div class="col-md-2">
<input id="numero" name="numero" type="text" placeholder="" class="form-control input-md">
</div>
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="ciudad">Ciudad</label>
<div class="col-md-6">
<input id="ciudad" name="ciudad" type="text" placeholder="" class="form-control input-md">