Census Links is a growing catalog of links to transcriptions of census, tax lists, birth, death, marriage and military records, all freely available to help with your genealogy research.
From the Native American Research in Michigan Website
1850 Census, Mackinac County, Michigan (Index)
1850 Federal, Mackinaw, County, Michigan
1850 Mortality Schedule, Mackinac County, Michigan
From the UsGenWeb Census Project
Marriages, Mackinac County, Michigan