The boundaries of Washtenaw County were established in 1822 from parent counties of Wayne and Oakland. The first settlements were established in 1823-24. Washtenaw County was officially established on January 1, 1827. The county seat is Ann Arbor.
Birth, marriage, and death records (see Vital Records) are found in the Clerk's office. Wills and estates are at the Probate Court office. Records begin in 1827. Deeds and mortgages (see Land Records) are found in the Register of Deeds office.