Filter mail recipient of WooCommerce new order mail based on shipping zone.

filter-new-woo-order-mail-shipping-zone.php

add_filter( 'woocommerce_email_recipient_new_order', 'custom_new_order_recipient', 10, 2 );

function custom_new_order_recipient( $recipient, $order ) {
    $shipping_zone = WC_Shipping_Zones::get_zone_matching_package( $order->get_shipping_packages() );
    if ( $shipping_zone ) {
        $zone_id = $shipping_zone->get_id();
        // You can add more conditions to match specific shipping zones here
        if ( $zone_id == 1 ) {
            $recipient .= ', john@example.com';
        } elseif ( $zone_id == 2 ) {
            $recipient .= ', jane@example.com';
        }
    }
    return $recipient;
}