[2] Its population is 633,702 (2021), and its area is 2,228.4 km2 (860.4 sq mi).

[3] The communes of the arrondissement of Rennes, and their INSEE codes, are:[2] The arrondissement of Rennes was created in 1800.

[4] In 2010 it lost the six cantons of Argentré-du-Plessis, Châteaubourg, La Guerche-de-Bretagne, Retiers, Vitré-Est and Vitré-Ouest to the new arrondissement of Fougères-Vitré.

[6] As a result of the reorganisation of the cantons of France which came into effect in 2015, the borders of the cantons are no longer related to the borders of the arrondissements.

The cantons of the arrondissement of Rennes were, as of January 2015:[7]