Arrondissement of Riom

The arrondissement of Riom is an arrondissement of France. It is part of the Puy-de-Dôme "département", Auvergne-Rhône-Alpes region. Its capital, and a subprefecture of the department, is the city of Riom.
History.
When the Puy-de-Dôme department was created in 1790, the "arrondissement" of Riom was part of that original department.
Geography.
The "arrondissement" of Riom is the most northern of the "arrondissements" of the department and borders to the north with the Allier department, to the east with the "arrondissement" of Thiers, to the southeast with the "arrondissement" of Clermont-Ferrand, to the south with the "arrondissement" of Issoire, and to the west with the Creuse department.
The "arrondissement" of Riom is the largest "arrondissement" of the department, with an area of , and the second in population with 121,158 inhabitants and a density of inhabitants/km².
Composition.
Cantons.
After the reorganisation of the cantons in France, cantons are not subdivisions of the "arrondissements" so they could have "communes" that belong to different "arrondissements".
In the "arrondissement" of Riom there are 10 cantons:
Communes.
The "arrondissement" of Riom has 155 "communes"; they are (with their INSEE codes):
The "communes" with more inhabitants in the "arrondissement" are: