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Michigan Genealogy by County

County County Seat Formed Origin
Alcona County Harrisville 1840 (boundaries declared)
1869 (organized)
From unorganized territory. Was named Negwegon County until 1843.
Alger County Munising 1885 From part of Schoolcraft County.
Allegan County Allegan 1831 (boundaries declared)
1835 (organized)
From part of Barry County and unorganized territory.
Alpena County Alpena 1840 (boundaries declared)
1857 (organized)
From part of Mackinac County and unorganized territory. Was named Anamickee County until 1843.
Antrim County Bellaire 1840 From part of Mackinac County. Was named Meegisee County until 1843.
Arenac County Standish 1831 From unorganized territory. Annexed to Bay County in 1857 and reinstated in 1883.
Baraga County L'Anse 1875 From part of Houghton County.
Barry County Hastings 1829 From unorganized territory.
Bay County Bay City 1857 From parts of Arenac County, Midland County and Saginaw County.
Benzie County Beulah 1863 From part of Leelenau County.
Berrien County St. Joseph 1829 From unorganized territory.
Branch County Coldwater 1829 From unorganized territory.
Calhoun County Marshall 1829 From unorganized territory.
Cass County Cassopolis 1829 From unorganized territory.
Charlevoix County Charlevoix 1869 From parts of Antrim County, Emmet County and Otsego County.
Cheboygan County Cheboygan 1840 From part of Mackinac County.
Chippewa County Sault Ste. Marie 1827 From part of Mackinac County.
Clare County Harrison 1840 From part of Mackinac County and unorganized territory. Was named Kaykakee County until 1843.
Clinton County St. Johns 1831 From unorganized territory.
Crawford County Grayling 1840 From part of Mackinac County and unorganized territory. Was named Shawano County until 1843.
Delta County Escanaba 1843 From part of Mackinac County and unorganized territory.
Dickinson County Iron Mountain 1891 From parts of Iron County, Marquette County and Menominee County.
Eaton County Charlotte 1829 From unorganized territory.
Emmet County Petoskey 1840 From part of Mackinac County. Was named Tonegadana County until 1843.
Genesee County Flint 1835 From parts of Lapeer County, Saginaw County and Shiawassee County.
Gladwin County Gladwin 1831 From unorganized territory.
Gogebic County Bessemer 1887 From part of Ontonagon County.
Grand Traverse County Traverse City 1851 From part of Omeena County.
Gratiot County Ithaca 1831 From unorganized territory.
Hillsdale County Hillsdale 1829 From unorganized territory.
Houghton County Houghton 1845 From parts of Marquette County and Ontonagon County.
Huron County Bad Axe 1840 From part of Sanilac County.
Ingham County Mason 1829 (boundaries declared)
1838 (organized)
From parts of Shiawassee County, Washtenaw County and unorganized territory.
Ionia County Ionia 1831 From part of Mackinac County and unorganized territory.
Iosco County Tawas City 1840 From unorganized territory. Was named Kanotin County until 1843.
Iron County Crystal Falls 1885 From parts of Marquette County and Menominee County.
Isabella County Mt. Pleasant 1831 From part of Mackinac County and unorganized territory.
Jackson County Jackson 1829 (boundaries declared)
1832 (organized)
From part of Washtenaw County and unorganized territory.
Kalamazoo County Kalamazoo 1829 From unorganized territory.
Kalkaska County Kalkaska 1840 From part of Mackinac County. Was named Wabassee County until 1843.
Kent County Grand Rapids 1831 From part of Mackinac County and unorganized territory.
Keweenaw County Eagle River 1861 From part of Houghton County.
Lake County Baldwin 1840 From part of Mackinac County. Was named Aischum County until 1843.
Lapeer County Lapeer 1822 From parts of Oakland County and St. Clair County.
Leelanau County Suttons Bay Township 1840 From part of Mackinac County.
Lenawee County Adrian 1822 From part of Monroe County.
Livingston County Howell 1833 (boundaries declared)
1836 (organized)
From parts of Shiawassee County and Washtenaw County.
Luce County Newberry 1887 From parts of Chippewa County and Mackinac County.
Mackinac County St. Ignace 1818 From part of Wayne County. Was named Michilimackinac County until 1837.
Macomb County Mt. Clemens 1818 From part of Wayne County.
Manistee County Manistee 1840 From part of Mackinac County.
Marquette County Marquette 1843 From parts of Chippewa County and Mackinac County.
Mason County Ludington 1840 From part of Mackinac County. Was named Notipekago County until 1843.
Mecosta County Big Rapids 1840 From parts of Mackinac County and Oceana County.
Menominee County Menominee 1861 From part of Delta County. Was named Bleeker County until 1863.
Midland County Midland 1831 From part of Saginaw County and unorganized territory.
Missaukee County Lake City 1840 From part of Mackinac County.
Monroe County Monroe 1817 From part of Wayne County.
Montcalm County Stanton 1831 From part of Mackinac County and unorganized territory.
Montmorency County Atlanta 1840 From part of Mackinac County and unorganized territory. Was named Cheonoquet County until 1843.
Muskegon County Muskegon 1859 From parts of Oceana County and Ottawa County.
Newaygo County White Cloud 1840 From parts of Mackinac County and Oceana County.
Oakland County Pontiac 1819 (boundaries declared)
1820 (organized)
From part of Macomb County.
Oceana County Hart 1831 From part of Mackinac County.
Ogemaw County West Branch 1840 From unorganized territory. Annexed to Iosco County in 1867 and reinstated in 1873.
Ontonagon County Ontonagon 1843 From parts of Chippewa County and Mackinac County.
Osceola County Reed City 1840 From part of Mackinac County. Was named Unwattin County until 1843.
Oscoda County Mio 1840 From part of Mackinac County and unorganized territory.
Otsego County Gaylord 1840 From part of Mackinac County. Was named Okkudo County until 1843.
Ottawa County Grand Haven 1831 From part of Mackinac County and unorganized territory.
Presque Isle County Rogers City 1840 From part of Mackinac County.
Roscommon County Roscommon 1840 From part of Mackinac County and unorganized territory. Was named Mikenauk County until 1843.
Saginaw County Saginaw 1822 From part of Oakland County.
Sanilac County Sandusky 1822 From part of St. Clair County.
Schoolcraft County Manistique 1843 From parts of Chippewa County and Mackinac County.
Shiawassee County Corunna 1822 From parts of Oakland County and St. Clair County.
St. Clair County Port Huron 1820 From part of Macomb County.
St. Joseph County Centreville 1829 From unorganized territory.
Tuscola County Caro 1840 From part of Sanilac County.
Van Buren County Paw Paw 1829 From unorganized territory.
Washtenaw County Ann Arbor 1822 (boundaries declared)
1826 (organized)
From parts of Oakland County and Wayne County
Wayne County Detroit 1815 All lands within Michigan Territory that had been ceded by Native Americans through the 1807 Treaty of Detroit.
Wexford County Cadillac 1840 From part of Mackinac County. Was named Kautawaubet County until 1843.


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