+66-42-(000000...999999): Udon Thani, Nong Bua Lamphu, Nong Khai, Nakhon Phanom, Mukdahan, Sakon Nakhon and Loei, North-Eastern Region Xem thêm về +66-42-(000000...999999)
+66-44-(000000...999999): Nakhon Ratchasima, Surin, Buriram and Chaiyaphum, North-Eastern Region Xem thêm về +66-44-(000000...999999)
+66-45-(000000...999999): Ubon Ratchathani, Amnat Charoen, Si Sa Ket and Yasothon, North-Eastern Region Xem thêm về +66-45-(000000...999999)
