This is what you're looking for, tested and I use it on my own sites:

function the_slug_exists($post_name) { global $wpdb; if($wpdb->get_row("SELECT post_name FROM wp_posts WHERE post_name = '" . $post_name . "'", 'ARRAY_A')) { return true; } else { return false; } 

}

You can then use it like this:

if (the_slug_exists('contact')) { // do something } 

Replace "contact" with whatever slug you want to test for.

This is what you're looking for, tested and I use it on my own sites:

function the_slug_exists($post_name) {  global $wpdb;  if($wpdb->get_row("SELECT post_name FROM wp_posts WHERE post_name = '" . $post_name . "'", 'ARRAY_A')) {   return true;  } else {   return false;  } } 

You can then use it like this:

if (the_slug_exists('contact')) { // do something } 

Replace contact with whatever slug you want to test for.