The Area Codes of Thailand:
| City/Town or Region | Area code |
| 1. | Kalasin, Khon Kaen, Maha Sarakham, Roi Et, Nam Nao | 043 |
| 2. | Kamphaeng Phet, Phitsanulok, Sukhothai, Tak, Uttaradit, Sam Ngam, Wachirabarami | 055 |
| 3. | Kanchanaburi, Nakhon Pathom, Samut Sakhon, Samut Songkhram | 034 |
| 4. | Krabi, Nakhon Si Thammarat, Trang | 075 |