Good to know · City hall
Use the citizen-attention offices (OIAC) and the 010 line
The Ciudad Autónoma runs Oficinas de Información y Atención al Ciudadano (OIAC) across the city plus a 010 phone line for information and paperwork.
- Why it matters
- They are the front door for registering documents, municipal information and appointments.
- When
- You need to file a form, register a document, or ask which municipal office handles something.
- Official page
- Atención al Ciudadano (OIAC)
- Last checked
- 7 Oct 2026
In the guide: the 4 steps, the 8 offices with addresses and hours, and tips and what to watch for, with every official source.