I posted this response a few weeks ago, but would like to add an addendum.
I neglected to mention one of the most important sources of genealogical information for Manistee County families, which is the Manistee Historical Museum on River Street. They have a wonderful card index by surname, which includes detailed census data, as well as cemetery records, and information from county newspapers including obituaries, births, marriages, divorces, etc.
Another ongoing project is an index of articles from the Manistee News Advocate, at present indexed up to 1923. The Advocate is available in several libraries on microfilm, so this index is a most valuable tool.