The WooCommerce Orders Table, which can be found under WP Dashboard > WooCommerce > Orders, provides us with 7 default columns: Order – Date – Status – Billing – Ship to – Total – Actions. This is used by shop managers to have an overview of all orders, before eventually clicking on a specific one.
So the question is: how can we display additional columns to that same orders table, so that we can immediately visualize an order custom field, a specific product contained in the order, or anything order-related that can be “calculated” once we have access to the $order variable?

PHP Snippet: Display Custom Column @ WooCommerce Admin Orders Table
/**
* @snippet Add Column to Orders Table (e.g. Billing Country) - WooCommerce
* @how-to Get CustomizeWoo.com FREE
* @sourcecode https://businessbloomer.com/?p=78723
* @author Rodolfo Melogli
* @compatible WooCommerce 3.4.5
*/
add_filter( 'manage_edit-shop_order_columns', 'bbloomer_add_new_order_admin_list_column' );
function bbloomer_add_new_order_admin_list_column( $columns ) {
$columns['billing_country'] = 'Country';
return $columns;
}
add_action( 'manage_shop_order_posts_custom_column', 'bbloomer_add_new_order_admin_list_column_content' );
function bbloomer_add_new_order_admin_list_column_content( $column ) {
global $post;
if ( 'billing_country' === $column ) {
$order = wc_get_order( $post->ID );
echo $order->get_billing_country();
}
}