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:

 Aigueperse (6301)
 Cébazat (6307) (partly)
 Châtel-Guyon (6309) (partly)
 Gerzat (6317) (partly)
 Maringues (6320) (partly)
 Orcines (6323) (partly)
 Riom (6325)
 Saint-Éloy-les-Mines (6326)
 Saint-Georges-de-Mons (6327)
 Saint-Ours (6328) (partly)

Communes
The arrondissement of Riom has 155 communes; they are (with their INSEE codes):

 Aigueperse (63001)
 Les Ancizes-Comps (63004)
 Ars-les-Favets (63011)
 Artonne (63012)
 Aubiat (63013)
 Ayat-sur-Sioule (63025)
 Bas-et-Lezat (63030)
 Beaumont-lès-Randan (63033)
 Beauregard-Vendon (63035)
 Biollet (63041)
 Blot-l'Église (63043)
 Bourg-Lastic (63048)
 Briffons (63053)
 Bromont-Lamothe (63055)
 Bussières (63060)
 Bussières-et-Pruns (63061)
 Buxières-sous-Montaigut (63062)
 La Celle (63064)
 La Cellette (63067)
 Chambaron-sur-Morge (63244)
 Champs (63082)
 Chanat-la-Mouteyre (63083)
 Chapdes-Beaufort (63085)
 Chappes (63089)
 Chaptuzat (63090)
 Charbonnières-les-Varennes (63092)
 Charbonnières-les-Vieilles (63093)
 Charensat (63094)
 Châteauneuf-les-Bains (63100)
 Château-sur-Cher (63101)
 Châtel-Guyon (63103)
 Chavaroux (63107)
 Le Cheix (63108)
 Cisternes-la-Forêt (63110)
 Clerlande (63112)
 Combrailles (63115)
 Combronde (63116)
 Condat-en-Combraille (63118)
 La Crouzille (63130)
 Davayat (63135)
 Durmignat (63140)
 Effiat (63143)
 Ennezat (63148)
 Entraigues (63149)
 Enval (63150)
 Espinasse (63152)
 Fernoël (63159)
 Giat (63165)
 Gimeaux (63167)
 La Goutelle (63170)
 Gouttières (63171)
 Herment (63175)
 Jozerand (63181)
 Landogne (63186)
 Lapeyrouse (63187)
 Lastic (63191)
 Limons (63196)
 Lisseuil (63197)
 Loubeyrat (63198)
 Lussat (63200)
 Luzillat (63201)
 Malauzat (63203)
 Malintrat (63204)
 Manzat (63206)
 Marcillat (63208)
 Maringues (63210)
 Marsat (63212)
 Les Martres-d'Artière (63213)
 Martres-sur-Morge (63215)
 Menat (63223)
 Ménétrol (63224)
 Messeix (63225)
 Miremont (63228)
 Mons (63232)
 Montaigut (63233)
 Montcel (63235)
 Montel-de-Gelat (63237)
 Montfermy (63238)
 Montpensier (63240)
 Moureuille (63243)
 Mozac (63245)
 Neuf-Église (63251)
 Pessat-Villeneuve (63278)
 Pionsat (63281)
 Pontaumur (63283)
 Pontgibaud (63285)
 Pouzol (63286)
 Prompsat (63288)
 Prondines (63289)
 Pulvérières (63290)
 Puy-Saint-Gulmier (63292)
 Le Quartier (63293)
 Queuille (63294)
 Randan (63295)
 Riom (63300)
 Roche-d'Agoux (63304)
 Saint-Agoulin (63311)
 Saint-André-le-Coq (63317)
 Saint-Angel (63318)
 Saint-Avit (63320)
 Saint-Beauzire (63322)
 Saint-Bonnet-près-Riom (63327)
 Saint-Clément-de-Régnat (63332)
 Saint-Denis-Combarnazat (63333)
 Sainte-Christine (63329)
 Saint-Éloy-les-Mines (63338)
 Saint-Étienne-des-Champs (63339)
 Saint-Gal-sur-Sioule (63344)
 Saint-Genès-du-Retz (63347)
 Saint-Georges-de-Mons (63349)
 Saint-Germain-près-Herment (63351)
 Saint-Gervais-d'Auvergne (63354)
 Saint-Hilaire (63360)
 Saint-Hilaire-la-Croix (63358)
 Saint-Hilaire-les-Monges (63359)
 Saint-Ignat (63362)
 Saint-Jacques-d'Ambur (63363)
 Saint-Julien-la-Geneste (63369)
 Saint-Laure (63372)
 Saint-Maigner (63373)
 Saint-Maurice-près-Pionsat (63377)
 Saint-Myon (63379)
 Saint-Ours (63381)
 Saint-Pardoux (63382)
 Saint-Pierre-le-Chastel (63385)
 Saint-Priest-Bramefant (63387)
 Saint-Priest-des-Champs (63388)
 Saint-Quintin-sur-Sioule (63390)
 Saint-Rémy-de-Blot (63391)
 Saint-Sulpice (63399)
 Saint-Sylvestre-Pragoulin (63400)
 Sardon (63406)
 Sauret-Besserve (63408)
 Sauvagnat (63410)
 Savennes (63416)
 Sayat (63417)
 Servant (63419)
 Surat (63424)
 Teilhède (63427)
 Teilhet (63428)
 Thuret (63432)
 Tortebesse (63433)
 Tralaigues (63436)
 Varennes-sur-Morge (63443)
 Vensat (63446)
 Vergheas (63447)
 Verneugheol (63450)
 Villeneuve-les-Cerfs (63459)
 Villosanges (63460)
 Virlet (63462)
 Vitrac (63464)
 Voingt (63467)
 Volvic (63470)
 Youx (63471)
 Yssac-la-Tourette (63473)

The communes with more inhabitants in the arrondissement are:

Related pages
 Arrondissements of the Puy-de-Dôme department
 List of arrondissements of France

References

Riom
Auvergne-Rhône-Alpes