Makes the state field in WooCommerce checkout always required.

woo-require-state-in-checkout-always.php

/* https://www.mootpoint.org/blog/woocommerce-make-uk-county-field-required/ for an excellent description on why this filter. */


add_filter( 'woocommerce_get_country_locale', 'mp_change_locale_field_defaults');
 
function mp_change_locale_field_defaults($countries) {
    //swap 'RO' for your country ID. 
    $countries['RO']['state']['required'] = true;
    //set custom field label
    $countries['RO']['state']['label'] = '';
    return $countries;
}