SAAA
Shoreline Amateur Astronomical Association. Established in 1989, the Shoreline Amateur Astronomical Association is a non-profit organization created for the purpose of furthering the enjoyment of amateur astronomy. SAAA membership is open to the public and consists of enthusiasts from Holland, Michigan and it’s neighboring shoreline communities
http://www.holland-saaa.org/ - Details

CAS
The Calumet Astronomical Society, Inc. (CAS) is a 501(c)(3) not-for-profit corporation founded in 1975, and incorporated in 2000, for the purpose of pursuing the study of astronomy and promoting the education of of astronomy and space science. The CAS membership consists of amateur astronomy enthusiasts from the Northwest Indiana and southern Chicago metropolitan regions. Although most of the membership does not enjoy the luxury of dark tranquil skies from their back yards, the 200+ members
http://www.casonline.org/ - Details

KAS
Kalamazoo Astronomical Society
http://www.kasonline.org/ - Details

GRAAA
The GRAND RAPIDS AMATEUR ASTRONOMICAL ASSOCIATION Includes individuals with wide levels of expertise and knowledge of the science of Astronomy, from the beginner to professional. For over fifty years the GRAAA continues to flourish, due to the enthusiasm and dedication of its members.
http://www.graaa.org/ - Details

MAS
The Muskegon Astronomical Society was founded in 1972, incorporated in 1978, and given 501(C3) non-profit status in 1987. We have gone from a small dome in town to a multi-building complex at the Muskegon wastewater system. Today the society continues to flourish thanks to the hard work and dedication of it's members.
http://www.stargazing.net/mas/ - Details

AAoJ
Amateur Astronomers of Jackson
http://aaoj.info/cons.htm - Details