Set the WooCommerce store city and zipcode / postcode

gistfile1.php

/**
 * Set the store base city and postcode / zipcode
 */
add_filter( 'woocommerce_countries_base_city' , 'set_woocommerce_countries_base_city' );
function set_woocommerce_countries_base_city() {
	// Replace with your store town/city
	return 'Townland';
}

add_filter( 'woocommerce_countries_base_postcode' , 'set_woocommerce_countries_base_postcode' );
function set_woocommerce_countries_base_postcode() {
	// Replace with your store postcode / zipcode
	return '45040';
}

What file do I place this in?

Your theme functions.php file

How do I configure more than one postcode at the same time? Just duplicate the code or do I postcodes separated by commas?

@ofernandolpes you can't, WooCommerce only supports one store address.