  viola (pronounced vy-ola) is a village in mercer county, illinois, united states. the population was 955 at the 2010 census, a loss of one person from 956 in 2000. ==geography== viola is located at  (41.203833, -90.584620). according to the 2010 census, the village has a total area of {{convert|0.
Villages_in_Illinois Villages_in_Mercer_County,_Illinois