get_pages sort alphabetically by meta value

The get_pages function is rather old and really shouldn’t be used anymore. Use a get_posts instead (a Page is just a special type of Post):

$listingPages = get_posts( 
    array(
        'meta_key' => 'streetAdd',
        'post_type' => 'page',
        'post_status' => 'publish',
        'orderby' => 'meta_value',
        'order' => 'ASC',
    )
);