The Area Codes of Thailand:
| City/Town or Region | Area code |
| 1. | Chachoengsao, Chon Buri, Rayong | 038 (+6638) |
| 2. | Chai Nat, Nakhon Sawan, Phetchabun, Phichit, Uthai Thani | 056 (+6656) |
| 3. | Chanthaburi, Trat | 039 (+6639) |
| 4. | Chiang Mai, Chiang Rai, Lamphun, Mae Hong Son | 052 (+6652) |
| 5. | Chiang Mai, Chiang Rai, Lamphun, Mae Hong Son | 053 (+6653) |
| 6. | Chumphon, Ranong, Surat Thani | 077 (+6677) |