| Police | 100 |
| Fire Control | 101 |
| JSSK – Janani Sishu Suraksha Kariyakaram | 102 |
| Traffice Police | 103 |
| Accident Helpline | 108 |
| Disaster Helpline | 1077 |
| Child Helpline | 1098 |
| Women Helpline | 181 |
| Lions Blood Bank | 28415959 |
| St. Johns Ambulance Association | 28194630 |
| Chennai Corporation Complaints | 1913 |
| Railways Reservation Enquiry | 132 |
| Automated Reservation Query | 139 |
| Tourist Enquiry | 1913 |
| Tourism Office of Govt. of Tamil Nadu | 25368538 |
| Tourism Office of Govt. of India | 28460285 |
| BSNL Telephone Directory Enquiry | 197 |
| BSNL Telephone Local Assistance | 199 |
| Eye Bank | 1919 |
| Gas Helpline | 1716 |