MSA: Metropolitan Statistical Area as defined for the US
Census, a county or group of contiguous counties (or, in New
England, Consolidated Metropolitan Areas) that contain at
least one city of 50,000 inhabitants or more. (Known as
"St... (view details)
Taken from: Monitoring the Future: A Continuing Study of American Youth (8th- and 10th-Grade Surveys), 2004 - 8th-Grade Form 1 Data.