Minnesota Salary Data

Awhile back I found a site that shows some employment / salary data for regions across Minnesota.  However, I have to doubt the veracity of the information, since the claim is that there're only 30 electrical engineers in Rochester.  The preceding excludes computer hardware engineers, but that number too seems abysmally low.  As with all the surveys of this sort, I have to doubt whether the classification for job and industry are always correctly made.