Wordpress : Strict to Area e.g Putrajaya

add_filter( 'woocommerce_states', 'custom_woocommerce_states' );

function custom_woocommerce_states( $states ) {
  $states['MY'] = array(
    'PJY' => 'Putrajaya'
  );

  return $states;
}

//add this at child theme function.php