Most people don’t realize that a substantial portion of the population got out. Approximately 2/3rds to 3/4.
CC
Yup, at least, if based on the number of known bodies (about 1100, sez here) in a population circa 20,000. The towns were probably comfortably well off, there appear to be too many entertainment venues. Baiae was a sort of resort town and didn’t get buried, but much later on the former posh waterfront went underwater due to seismic activity.