The international code for Thailand is 66. The long distance code for Chiang Rai is 053 for domestic calls, and 53 for international calls.
| Public Relations | 711870 |
| Police, Chiang Rai Provincial Station | 711444 |
| Police,Mae Fah Luang District station | 607004 |
| Tourist Police, Chiang Rai | 717779 |
| Chiang Rai International Airport | 793048 |
| Thai International Airways |
711179, |
| Chiang Rai Bus Station | 711224 |
| Chiang Rai Prachanukroh Hospital | 711300 |
| Over Brook Hospital | 711366 |
| Mae Chan Hospital | 771056 |
| Mae Sai Hospital | 731300 |
| Chiang Rai Tourism Association | 711062 |