It's not Maplewood (Ramsey County) that will take the worst tax hit.
It is Woodbury, Lake Elmo (Washington County) and points generally east of there, including Wisconsin, that will take the biggest hit. Housing in those places is about to get a lot cheaper soon with all the 3Mers moving elsewhere.
Woodbury is so bad, a person almost can't swing a golf club without hitting someone who is living on a 3M salary. Take away ~1,500 3M salaries from there and it will sting.
The good news is that some local employers are starting to actively hunt for laid-off 3Mers. I think a good fraction of them, but not all, will end up with new job offers before their severance is used up.