 niles is a city in trumbull county, ohio, united states. the city's population was 19,266 at the 2010 census.quickfacts: niles demography it is part of the [[youngstownâwarrenâboardman metropolitan statistical area|youngstown-warren-boardman, oh-pa metropolitan statisti
Cities_in_Ohio Cities_in_Trumbull_County,_Ohio Italian-American_culture_in_Ohio Niles,_Ohio Populated_places_established_in_1806 YoungstownaWarrenaBoardman,_OHaPA_metropolitan_area