$query = new WP_Query( array( 'meta_query' => array( 'relation' => 'AND', 'state_clause' => array( 'key' => 'state', 'value' => 'Wisconsin', ), 'city_clause' => array( 'key' => 'city', 'compare' => 'EXISTS', ), ), 'orderby' => array( 'city_clause' => 'ASC', 'state_clause' => 'DESC', ), ) );