| Abandoned/Dilapidated Buildings | Building Inspection | 393-8240 |
| Abandoned Vehicles: On Street | Police Non-Emergency | 753-2108 |
| Abandoned Vehicles: On Private Property | Environmental Health | 393-8440 |
| ADA (Americans With Disabilities Act) | ADA Coordinator | 393-8239 |
| Addresses, Official | Planning & Dev. Services | 393-8230 |
| Adopt-A-School | San Marcos CISD(public schools) | 393-6990 |
| Adopt-A-Street | Public Works | 393-8010 |
| Airport Information | Airport Director | 393-8160 |
| Alley Cleanup | Public Works | 393-8010 |
| Annexation Information | Planning & Dev. Services | 393-8230 |
| Animal Bites, Rabies Control (day) | Animal Shelter | 393-8340 |
| Animal Bites, Rabies Control (night) | Police Non-Emergency | 753-2108 |
| Animal Control | Animal Shelter | 393-8340 |
| Athletic Activities Schedule, (live) | Parks & Recreation | 393-8400 |
| Athletic Activities Schedule, (recording) | Parks & Recreation | 393-8404 |