Catonsville (kāˈtənzvĭl) [key], uninc. city (1990 pop. 35,233), Baltimore co., N Md., a suburb of Baltimore. The town is known for the "Catonsville Nine," a group of opponents of the Vietnam War who destroyed draft records there in 1968 in protest against the conflict. The Univ. of Maryland, Baltimore County, is in the city.