| Émile Burgault - Mayor of Vannes (Republican) | Initiator and project leader since 1847. |
| Amand Charrier - Architecte valveaise | Designer of plans inspired by the Paris City Hall. |
| Félix Granet - Minister of Post | Inaugurate the building in 1886. |
| Jean Bernard - Under-Secretary of State for the Interior | Present at the inauguration of 1886. |
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