The "superzips" (I infer from your prior links to Murray) refer to SuperZips and the rest of America's zip codes (by Charles Murray, American Enterprise Institute, February 13, 2012), with a large Excel file ranking 31720 zips (subtract 8 from the # in col. A to get the ranking).

Of which, 49931 (Houghton) is #4263 (41.70% w/BAs, $62,416.98 med. inc.); 49855 (Marquette) is #5633 (31.33% w/BAs, $66,834.05 med. fam. inc.); 49866 (Negaunee) is #9789 (21.40% w/BAs, $59,800.47 med. fam. inc.); 49825 (Eben Junction) is #10241 (20.45% w/BAs, $59.659.25 med. fam. inc.); my 49930 (Hancock) is #10674 (25.69% w/BAs, $49,035.00 med. fam. inc.). Those are the UP's "superzips". You know the towns. So, you also know I'm kidding about the "superzip" part.

Actually, I learned this factoid from a review of Murray's book (link):

To define such neighborhoods objectively, Murray created a scoring system that combined average income with percentage of college graduates. Then he ranked zip code areas nationwide. Those with scores in the top five centiles he designated “SuperZips.” There are 882 of them in America.
That takes us down to #890: 48167 (Northville, MI; 47.67% w/BAs, $128,597.20 med. fam. inc.).

All of this interests me; but you are going to have to lead me to what you want for an answer - cuz I don't get the question.

Regards

Mike