Mecklenburg-Schwerin Archives and Libraries
Here is a website for the State Archives and others in Mecklenburg-Vorpommern:
This website will give you all possible record locations for a given place name. For instance: For the town Zarrentin, one can find documents in the city archives of Stralsund, Wismar, and Schwerin in the state archives of Greifswald and Schwerin, in the communal archive of Nordvorpommern and in the Church archive in Schwerin. Clicking on the boxes at the left will then give further information about the time frame of the documents.
Here is a website for the Evangelical Church Archive