Name of County
|
Date Formed
|
Boundary Changes
|
Parent County
|
Counties Created by Boundary Changes
|
Aishcum
|
1840 Apr 01
|
Details
|
Oceana
|
renamed Lake 1843
|
Alcona
|
1843 Mar 08
|
Details
|
renamed from Neewago
|
Oscoda
|
Alger
|
1885 Mar 17
|
Details
|
Schoolcraft
|
none
|
Allegan
|
1831 Mar 02
|
Details
|
Kalamazoo
|
none
|
Alpena
|
1843 Mar 08
|
Details
|
renamed from Anamickee
|
Alcona 1869, Oscoda 1840, Otsego 1840
|
Anamickee
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Alpena 1843
|
Antrim
|
1843 Mar 08
|
Details
|
renamed from Meegisee
|
none
|
Arenac
|
1831 Mar 02
|
Details
|
Bay, Saginaw
|
none
|
Baraga
|
1875 Feb 19
|
Details
|
Houghton
|
none
|
Barry
|
1829 Oct 29
|
Details
|
St. Joseph, Kalamazoo
|
none
|
Bay
|
1857 Feb 17
|
Details
|
Saginaw, Midland
|
Arenac 1831
|
Benzie
|
1863 Feb 27
|
Details
|
Grand Traverse, Leelanau
|
none
|
Berrien
|
1829 Oct 29
|
Details
|
Cass
|
none
|
Bleeker
|
1861 1 18
|
Details
|
Marquette
|
renamed Menominee 1863
|
Branch
|
1829 Oct 29
|
Details
|
Michigan Territory
|
none
|
Brown
|
1818 Oct 26
|
Details
|
Michigan Territory
|
now in State of Wisconsin
|
Calhoun
|
1829 Oct 29
|
Details
|
St. Joseph, Kalamazoo
|
Eaton 1829
|
Cass
|
1829 Oct 29
|
Details
|
Lenawee
|
Berrien 1829, Van Buren 1837
|
Charlevoix
|
1843 Mar 08
|
Details
|
renamed from Reshkaiko
|
none
|
Cheboygan
|
1840 Apr 01
|
Details
|
Mackinac
|
Alcona 1859, Alpena 1857, Forrest 1913, Iosco 1857, Ogemaw 1875, Oscoda 1840, Otsego 1840
|
Cheonoquet
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Montmorency 1843
|
Chippewa
|
1826 Dec 26
|
Details
|
Mackinac
|
Houghton 1845, Luce 1887, Ontonagon 1848, Schoolcraft 1848
|
Clare
|
1843 Mar 08
|
Details
|
renamed from Kaykakee
|
none
|
Clinton
|
1831 Mar 02
|
Details
|
Shiawassee, Kent
|
Gratiot 1855
|
Crawford (old)
|
1818 Oct 26
|
Details
|
Michigan Territory
|
now in State of Wisconsin
|
Crawford
|
1840 Apr 01
|
Details
|
Michigan Territory
|
none
|
Delta
|
1843 Mar 09
|
Details
|
Schoolcraft
|
none
|
Demoine
|
1833 Jun 01
|
Details
|
Michigan Territory
|
now in State of Iowa
|
Dickinson
|
1851 Jan 15
|
Details
|
Kossuth
|
Emmet 1851
|
Dubuque (old)
|
1834 Sep 06
|
Details
|
Michigan Territory
|
now in State of Iowa
|
Eaton
|
1829 Oct 29
|
Details
|
St. Joseph, Calhoun, Kalamazoo
|
Ingham 1829
|
Emmet
|
1843 Mar 08
|
Details
|
renamed from Tonedagana
|
Charlevoix 1869
|
Genesee
|
1836 Mar 08
|
Details
|
Oakland
|
none
|
Gladwin
|
1831 Mar 02
|
Details
|
Saginaw, Midland
|
none
|
Gogebic
|
1881 Feb 07
|
Details
|
Ontonagon
|
none
|
Grand Traverse
|
1840 Apr 01
|
TRAVERSE Details
|
Mackinac
|
Antrim 1843, Benzie 1863, Leelanau 1863
|
Gratiot
|
1831 Mar 02
|
Details
|
Saginaw, Clinton
|
none
|
Hillsdale
|
1829 Oct 29
|
Details
|
Lenawee
|
none
|
Houghton
|
1845 Mar 09
|
Details
|
Chippewa
|
Baraga 1875, Keweenaw 1861, Ontonagon 1848, Schoolcraft 1848
|
Huron
|
1840 Apr 01
|
Details
|
Saginaw, St. Clair, Sanilac
|
none
|
Ingham
|
1829 Oct 29
|
Details
|
Washtenaw, Eaton, Jackson
|
none
|
Ionia
|
1831 Mar 02
|
Details
|
Kent
|
Montcalm 1831
|
Iosco
|
1843 Mar 08
|
Details
|
renamed from Kanotin
|
Ogemaw 1875
|
Iowa
|
1829 Oct 09
|
Details
|
Michigan Territory
|
now in State of Wisconsin
|
Iron
|
1885 Apr 03
|
Details
|
Marquette, Menominee
|
none
|
Isabella
|
1831 Mar 02
|
Details
|
Saginaw, Midland
|
Clare 1871
|
Isle Royal
|
1875 5 18
|
Details
|
Keweenaw
|
dissolved 1897, part of Keweenaw
|
Jackson
|
1829 Oct 29
|
Details
|
Washtenaw
|
none
|
Kalamazoo
|
1829 Oct 29
|
Details
|
St. Joseph
|
Allegan 1835, Barry 1829, Calhoun 1829, Eaton 1829, Kent 1836
|
Kalkaska
|
1843 Mar 08
|
Details
|
renamed from Wabasee
|
none
|
Kanotin
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Iosco 1843
|
Kautawaubet
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Wexford 1843
|
Kaykakee
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Clare 1843
|
Kent
|
1831 Mar 02
|
Details
|
Kalamazoo
|
Clinton 1839, Ionia 1831, Mecosta 1859, Newaygo 1840, Ottawa 1837
|
Keweenaw
|
1861 Mar 11
|
Details
|
Houghton, Iowa
|
Isle Royal (dissolved 1897)
|
Lake
|
1843 Mar 08
|
Details
|
renamed from Aishcum
|
none
|
Lapeer
|
1822 Sep 10
|
Details
|
Oakland
|
Sanilac 1848
|
Leelanau
|
1840 Apr 01
|
Details
|
Grand Traverse
|
Benzie 1863
|
Lenawee
|
1822 Sep 10
|
Details
|
Indian lands
|
Cass 1829, Hillsdale 1835
|
Livingston
|
1836 Mar 24
|
Details
|
Shiawassee, Washtenaw
|
none
|
Luce
|
1887 Mar 01
|
Details
|
Chippewa, Mackinac
|
none
|
Mackinac
|
1843 Mar 08
|
Details
|
renamed from Michilimackinac
|
Cheboygan 1840, Chippewa 1826, Emmet 1853, Grand Traverse 1840, Luce 1887, Manistee 1855, Otsego 1840
|
Macomb
|
1818 Mar 11
|
Details
|
Wayne
|
none
|
Manistee
|
1840 Apr 01
|
Details
|
Mackinac, Ottawa, Oceana
|
none
|
Manitou
|
1855 Feb 13
|
Details
|
Michigan Territory
|
dissolved 1895
|
Marquette
|
1843 Mar 09
|
Details
|
Schoolcraft
|
Dickinson 1891, Iron 1885, Menominee 1863, Washington 1867
|
Mason
|
1843 Mar 08
|
Details
|
renamed from Notipekago
|
Lake 1871, Osceola 1869
|
Mecosta
|
1840 Apr 01
|
Details
|
Kent, Newaygo
|
Clare 1871, Osceola 1869
|
Meegisee
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Antrim 1843
|
Menominee
|
1863 Mar 19
|
Details
|
renamed from Bleeker 1861
|
Dickinson 1891, Iron 1885
|
Michilimackinac
|
1818 Oct 26
|
Details
|
Michigan Territory
|
renamed Mackinac 1843
|
Midland
|
1831 Mar 02
|
Details
|
Saginaw
|
Bay 1857, Clare 1871, Gladwin 1855, Isabella 1831, Ogemaw 1875
|
Mikensauk
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Roscommon 1843
|
Milwaukee
|
1834 Sep 06
|
Details
|
Michigan Territory
|
now in State of Wisconsin
|
Monroe
|
1817 Jul 14
|
Details
|
Wayne
|
none
|
Montcalm
|
1831 Mar 02
|
Details
|
Ionia
|
none
|
Montmorency
|
1843 Mar 08
|
Details
|
renamed from Cheonoguet
|
none
|
Muskegon
|
859 Feb 04
|
Details
|
Ottawa, Newaygo
|
none
|
Negwegon (old)
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Alcona 1843
|
Newaygo
|
1840 Ap 01
|
Details
|
Kent, Muskegon, Oceana
|
Lake 1871, Mecosta 1854, Osceola 1869, Muskegon 1859
|
Notipekago
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Mason 1843
|
Oakland
|
1819 Jan 12
|
Details
|
Michigan Territory
|
Genesee 1836, lapeer 1835, Sanilac 1848, Saginaw 1822, Shaiwassee 1822
|
Oceana
|
1831 Mar 02
|
Details
|
Ottawa
|
Lake 1871, Manistee 1855, Mason 1855, Newaygo 1840
|
Ogemaw
|
1875 Feb 27
|
Details
|
Cheboygan, Midland, Iosco
|
none
|
Okkado
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Otsego 1843
|
Ontonagon
|
1848 Apr 03
|
Details
|
Chippewa, Houghton
|
Gogebic 1881
|
Osceola
|
1843 Mar 08
|
Details
|
renamed from Unwattin
|
none
|
Oscoda
|
1840 Apr 01
|
Details
|
Michigan Territory
|
none
|
Otsego
|
1843 Mar 08
|
Details
|
renamed from Okkado
|
none
|
Ottawa
|
1831 Mar 02
|
Details
|
Kent
|
Manistee 1855, Mason 1855
|
Presque Isle
|
1840 Apr 01
|
ISLE Details
|
Michigan Territory
|
none
|
Reshkaiko
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Charlevoix 1843
|
Roscommon
|
1843 Mar 08
|
Details
|
renamed from Mikenauk
|
none
|
Saginaw
|
1822 Sep 10
|
Details
|
Oakland
|
Arenac 1883, Bay 1857, Gladwin 1855, Gratiot 1855, Huron 1840, Iosco 1857, Isabella 1831, Midland 1850
|
St. Clair
|
1820 Sep 10
|
CLAIR Details
|
Wayne
|
Huron 1840, Sanilac 1848
|
St. Joseph
|
1829 Oct 29
|
JOSEPH Details
|
Wayne
|
Barry 1829, Calhoun 1829, Eaton 1829, Kalamazoo 1829
|
Sanilac
|
1822 Sep 10
|
Details
|
Oakland, St. Clair, Lapeer
|
Huron 1840, Tuscola 1850
|
Schoolcraft
|
1843 Mar 09
|
Details
|
Chippewa, Houghton
|
Alger 1855, Delta 1861, Marquette 1851
|
Shawano
|
1818 Oct 26
|
Details
|
Michigan Territory
|
now in State of Wisconsin
|
Shiawassee
|
1822 Sep 10
|
Details
|
Oakland, Genesee
|
Clitnon 1839, Livingston 1836
|
Tonedagana
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Emmet 1843
|
Tuscola
|
1840 Apr 01
|
Details
|
Sanilac
|
none
|
Unwattin
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Osceola 1843
|
Van Buren
|
1829 Oct 29
|
BUREN Details
|
Cass
|
none
|
Wabasee
|
1840 Apr 01
|
Details
|
Michigan Territory
|
renamed Kalkaska 1843
|
Washtenaw
|
1822 Nov 20
|
Details
|
Wayne
|
Livingston 1836, Ingahm 1829, Jackson 1832
|
Wayne
|
1796 Aug 18
|
Details
|
Northwest Territory
|
Michilimackinac 1818, Macomb 1818, Monroe 1817, St. Clair 1820, St. Joseph 1820, Washtenaw 1826
|
Wexford
|
1843 Mar 08
|
Details
|
renamed from Kautawaubet
|
none
|