Add this code to your child theme’s functions.php file or via a plugin that allows custom functions to be added, such as the Dessky Snippets plugin. Please don’t add custom code directly to your parent theme’s functions.php file as this will be overwritten completely when you update the theme.

Don’t forget to add your own or modify shipping states in WooCommerce.

You must replace both instances of XX with your country code. This means each state id in the array must have your two letter country code before the number you assign to the state.

/**
 * Add or modify States
 */
add_filter( 'woocommerce_states', 'custom_woocommerce_states' );

function custom_woocommerce_states( $states ) {

  $states['XX'] = array(
    'XX1' => 'State 1', 
    'XX2' => 'State 2'
  );

  return $states;
}