Porto Franco
| Porto Franco | |
|---|---|
| Coordinates: 6°20′16″S 47°23′56″W / 6.33778°S 47.3989°W | |
| Country | Brazil | 
| Region | Northeast | 
| State | Maranhão | 
| Mesoregion | Sul Maranhense | 
| Population  (2020) | |
|  • Total | 24,092 | 
| Time zone | UTC−03:00 (BRT) | 
Porto Franco is a municipality in the state of Maranhão in the Northeast Region of Brazil. It is situated in front of Tocantinópolis, Tocantins, across the Tocantins River.