Post code / zip is required field by default. But you may want to change it. So if you want to remove post code / zip field on the checkout page, it’s very simple.

Woocommerce Remove Postcode/ZIP Field

1. Go to wp-content/themes/your-child-theme/
2. Open functions.php with note++ or etc editor
3. add this code

function my_billing_postcode( $address_fields ) {
 $address_fields['postcode']['required'] = false;
 return $address_fields;
}
add_filter( 'woocommerce_default_address_fields', 'my_billing_postcode' );

Official Documentation

If you have a question, please comment! I always want to help.

That’s All!