Riom is located in Clermont-Ferrand city, France at the 45.9, 3.1167 coordinates. Distance from Riom to other cities. are listed below, click on the city name to find distance between. Distance from Riom to Montlucon 63 km, to Aurillac 121 km, to Vichy 33 km. The green marker indicates the location of Riom.