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Michigan Genealogy by County

CountyCounty SeatFormedOrigin
Alcona CountyHarrisville1840 (boundaries declared)
1869 (organized)
From unorganized territory. Was named Negwegon County until 1843.
Alger CountyMunising1885From part of Schoolcraft County.
Allegan CountyAllegan1831 (boundaries declared)
1835 (organized)
From part of Barry County and unorganized territory.
Alpena CountyAlpena1840 (boundaries declared)
1857 (organized)
From part of Mackinac County and unorganized territory. Was named Anamickee County until 1843.
Antrim CountyBellaire1840From part of Mackinac County. Was named Meegisee County until 1843.
Arenac CountyStandish1831From unorganized territory. Annexed to Bay County in 1857 and reinstated in 1883.
Baraga CountyL'Anse1875From part of Houghton County.
Barry CountyHastings1829From unorganized territory.
Bay CountyBay City1857From parts of Arenac County, Midland County and Saginaw County.
Benzie CountyBeulah1863From part of Leelenau County.
Berrien CountySt. Joseph1829From unorganized territory.
Branch CountyColdwater1829From unorganized territory.
Calhoun CountyMarshall1829From unorganized territory.
Cass CountyCassopolis1829From unorganized territory.
Charlevoix CountyCharlevoix1869From parts of Antrim County, Emmet County and Otsego County.
Cheboygan CountyCheboygan1840From part of Mackinac County.
Chippewa CountySault Ste. Marie1827From part of Mackinac County.
Clare CountyHarrison1840From part of Mackinac County and unorganized territory. Was named Kaykakee County until 1843.
Clinton CountySt. Johns1831From unorganized territory.
Crawford CountyGrayling1840From part of Mackinac County and unorganized territory. Was named Shawano County until 1843.
Delta CountyEscanaba1843From part of Mackinac County and unorganized territory.
Dickinson CountyIron Mountain1891From parts of Iron County, Marquette County and Menominee County.
Eaton CountyCharlotte1829From unorganized territory.
Emmet CountyPetoskey1840From part of Mackinac County. Was named Tonegadana County until 1843.
Genesee CountyFlint1835From parts of Lapeer County, Saginaw County and Shiawassee County.
Gladwin CountyGladwin1831From unorganized territory.
Gogebic CountyBessemer1887From part of Ontonagon County.
Grand Traverse CountyTraverse City1851From part of Omeena County.
Gratiot CountyIthaca1831From unorganized territory.
Hillsdale CountyHillsdale1829From unorganized territory.
Houghton CountyHoughton1845From parts of Marquette County and Ontonagon County.
Huron CountyBad Axe1840From part of Sanilac County.
Ingham CountyMason1829 (boundaries declared)
1838 (organized)
From parts of Shiawassee County, Washtenaw County and unorganized territory.
Ionia CountyIonia1831From part of Mackinac County and unorganized territory.
Iosco CountyTawas City1840From unorganized territory. Was named Kanotin County until 1843.
Iron CountyCrystal Falls1885From parts of Marquette County and Menominee County.
Isabella CountyMt. Pleasant1831From part of Mackinac County and unorganized territory.
Jackson CountyJackson1829 (boundaries declared)
1832 (organized)
From part of Washtenaw County and unorganized territory.
Kalamazoo CountyKalamazoo1829From unorganized territory.
Kalkaska CountyKalkaska1840From part of Mackinac County. Was named Wabassee County until 1843.
Kent CountyGrand Rapids1831From part of Mackinac County and unorganized territory.
Keweenaw CountyEagle River1861From part of Houghton County.
Lake CountyBaldwin1840From part of Mackinac County. Was named Aischum County until 1843.
Lapeer CountyLapeer1822From parts of Oakland County and St. Clair County.
Leelanau CountySuttons Bay Township1840From part of Mackinac County.
Lenawee CountyAdrian1822From part of Monroe County.
Livingston CountyHowell1833 (boundaries declared)
1836 (organized)
From parts of Shiawassee County and Washtenaw County.
Luce CountyNewberry1887From parts of Chippewa County and Mackinac County.
Mackinac CountySt. Ignace1818From part of Wayne County. Was named Michilimackinac County until 1837.
Macomb CountyMt. Clemens1818From part of Wayne County.
Manistee CountyManistee1840From part of Mackinac County.
Marquette CountyMarquette1843From parts of Chippewa County and Mackinac County.
Mason CountyLudington1840From part of Mackinac County. Was named Notipekago County until 1843.
Mecosta CountyBig Rapids1840From parts of Mackinac County and Oceana County.
Menominee CountyMenominee1861From part of Delta County. Was named Bleeker County until 1863.
Midland CountyMidland1831From part of Saginaw County and unorganized territory.
Missaukee CountyLake City1840From part of Mackinac County.
Monroe CountyMonroe1817From part of Wayne County.
Montcalm CountyStanton1831From part of Mackinac County and unorganized territory.
Montmorency CountyAtlanta1840From part of Mackinac County and unorganized territory. Was named Cheonoquet County until 1843.
Muskegon CountyMuskegon1859From parts of Oceana County and Ottawa County.
Newaygo CountyWhite Cloud1840From parts of Mackinac County and Oceana County.
Oakland CountyPontiac1819 (boundaries declared)
1820 (organized)
From part of Macomb County.
Oceana CountyHart1831From part of Mackinac County.
Ogenaw CountyWest Branch1840From unorganized territory. Annexed to Iosco County in 1867 and reinstated in 1873.
Ontonagon CountyOntonagon1843From parts of Chippewa County and Mackinac County.
Osceola CountyReed City1840From part of Mackinac County. Was named Unwattin County until 1843.
Oscoda CountyMio1840From part of Mackinac County and unorganized territory.
Otsego CountyGaylord1840From part of Mackinac County. Was named Okkudo County until 1843.
Ottawa CountyGrand Haven1831From part of Mackinac County and unorganized territory.
Presque Isle CountyRogers City1840From part of Mackinac County.
Roscommon CountyRoscommon1840From part of Mackinac County and unorganized territory. Was named Mikenauk County until 1843.
Saginaw CountySaginaw1822From part of Oakland County.
Sanilac CountySandusky1822From part of St. Clair County.
Schoolcraft CountyManistique1843From parts of Chippewa County and Mackinac County.
Shiawassee CountyCorunna1822From parts of Oakland County and St. Clair County.
St. Clair CountyPort Huron1820From part of Macomb County.
St. Joseph CountyCentreville1829From unorganized territory.
Tuscola CountyCaro1840From part of Sanilac County.
Van Buren CountyPaw Paw1829From unorganized territory.
Washtenaw CountyAnn Arbor1822 (boundaries declared)
1826 (organized)
From parts of Oakland County and Wayne County
Wayne CountyDetroit1815All lands within Michigan Territory that had been ceded by Native Americans through the 1807 Treaty of Detroit.
Wexford CountyCadillac1840From part of Mackinac County. Was named Kautawaubet County until 1843.

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