This is quite a good overview.

However, the missing archives and registrations make it quite hard to get an exact picture. Most of the deaths came from hunger and disease and it's hard to differentiate between death and fled people in the archives. So it's all estimates.

Osnabrück is a very interesting case. It was a Prince-Bishopric before the Thirty Years War, and in the early 1630ies was meant to be a bridgehead for the Counter-Reformation in North Germany, the Jesuits were invited, a university founded. But then the Swedes came along (1633) and Osnabrück surrendered. The Catholics were forbidden to worship and a Swedish Administrator was installed. In the Peace of Westphallia, however, the Prince-Bishop somehow prevented the secularization, but with one caveat: Now a Protestant and a Catholic Bishop took turns in administrating the Bishopric! Isn't that marvelous. It stayed that way until the Bishopric was mediatized in 1803. It wasn't that devastated by the war.

Münster was also a Prince-Bishopric, and also was heavily involved in the Counter-Reformation at the time, until the Swedes came. Its territories suffered quite heavily in the war/ wars (25 years later the Brandenburg-Swedish War again devastated the territories) as the bishop was a known hardliner. The Bishop at the time, Ferdinand of Bavaria (he was the younger brother of Maximilian, Duke of Bavaria, later Elector of Bavaria), was also Bishop of Hildesheim, Liège and Paderborn and last, but not least, Prince-elector archbishop of Cologne. He survived the war for two years and immediately tried to recatholize his territories when he got them back. His sucessor, Christoph Bernhard von Galen, continued his work, but had to buy off the Protestant armies which still occupied his territories. He also had to occupy his own city when the inhabitants of Münster rebelled, after this he abolished the elections for the Rat and the Bürgermeister (the city council and the mayor) in Münster. He did indeed succeed in recatholizing the Münsterland.