Try changing this:
$query = "SELECT * FROM Addresses WHERE areas LIKE '%$city%' && Salutation LIKE '%$city2%' ORDER BY Rank ASC LIMIT 0,$limiter";
to this:
$query = "SELECT * FROM Addresses WHERE areas LIKE '%$city%' && Salutation LIKE '%" . $_REQUEST['city2'] . "%' ORDER BY Rank ASC LIMIT 0,$limiter";
Also, you didn't connect to the database, so that could be your problem.
In order to help you with your debugging, you may want to change this:
$numero = mysql_query($query);
to this:
$numero = mysql_query($query) or die(mysql_error());