I can lookup persons in 1845 census for these 9 townships only:
Novi, Troy, Royal Oak, Milford, Farmington, Bloomfield, West Bloomfield, Pontiac, Avon.
Info given only includes name of H.O.H; lists names of males age 21 years and over. Shows number of persons in the different age groups, male and female, but not individual names.
If you are uncertain of the township, please give names of possible neighbors, or where your family is located in 1850.
These pages are not indexed, so give me a little time.
This census (for Oakland Co) can be found at various libraries in Michigan: Royal Oak City library; Lake Orion library; Library of Michigan, Lansing. Possibly found at Flint library. May be found at others, so call and check.