Michigan County Creation Dates and Parent Counties
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| Name of County | Date Formed | Parent County | Progeny County |
| Aishcum | 01 Apr 1840 | Oceana | renamed Lake 1843 |
| Alcona | 08 Mar 1843 | renamed from Neewago | Oscoda |
| Alger | 17 Mar 1885 | Schoolcraft | none |
| Allegan | 02 Mar 1831 | Kalamazoo | none |
| Alpena | 08 Mar 1843 | renamed from Anamickee | Alcona 1869, Oscoda 1840, Otsego 1840 |
| Anamickee | 01 Apr 1840 | Michigan Territory | renamed Alpena 1843 |
| Antrim | 08 Mar 1843 | renamed from Meegisee | none |
| Arenac | 02 Mar 1831 | Bay, Saginaw | none |
| Baraga | 19 Feb 1875 | Houghton | none |
| Barry | 29 Oct 1829 | St. Joseph, Kalamazoo | none |
| Bay | 17 Feb 1857 | Saginaw, Midland | Arenac 1831 |
| Benzie | 27 Feb 1863 | Grand Traverse, Leelanau | none |
| Berrien | 29 Oct 1829 | Cass | none |
| Bleeker | 1861 | Marquette | renamed Menominee 1863 |
| Branch | 29 Oct 1829 | Michigan Territory | none |
| Brown | 26 Oct 1818 | Michigan Territory | now in State of Wisconsin |
| Calhoun | 29 Oct 1829 | St. Joseph, Kalamazoo | Eaton 1829 |
| Cass | 29 Oct 1829 | Lenawee | Berrien 1829, Van Buren 1837 |
| Charlevoix | 08 Mar 1843 | renamed from Reshkaiko | none |
| Cheboygan | 01 Apr 1840 | Mackinac | Alcona 1859, Alpena 1857, Forrest 1913, Iosco 1857, Ogemaw 1875, Oscoda 1840, Otsego 1840 |
| Cheonoquet | 01 Apr 1840 | Michigan Territory | renamed Montmorency 1843 |
| Chippewa | 26 Dec 1826 | Mackinac | Houghton 1845, Luce 1887, Ontonagon 1848, Schoolcraft 1848 |
| Clare | 08 Mar 1843 | renamed from Kaykakee | none |
| Clinton | 02 Mar 1831 | Shiawassee, Kent | Gratiot 1855 |
| Crawford (old) | 26 Oct 1818 | Michigan Territory | now in State of Wisconsin |
| Crawford | 01 Apr 1840 | Michigan Territory |
none |
| Delta | 09 Mar 1843 | Schoolcraft | none |
| Demoine | 01 Jun 1833 | Michigan Territory | now in State of Iowa |
| Dickinson | 15 Jan 1851 | Kossuth | Emmet 1851 |
| Dubuque (old) | 06 Sep 1834 | Michigan Territory | now in State of Iowa |
| Eaton | 29 Oct 1829 | St. Joseph, Calhoun, Kalamazoo | Ingham 1829 |
| Emmet | 08 Mar 1843 | renamed from Tonedagana | Charlevoix 1869 |
| Genesee | 08 Mar 1836 | Oakland | none |
| Gladwin | 02 Mar 1831 | Saginaw, Midland | none |
| Gogebic | 07 Feb 1881 | Ontonagon | none |
| Grand Traverse | 01 Apr 1840 | Mackinac | Antrim 1843, Benzie 1863, Leelanau 1863 |
| Gratiot | 02 Mar 1831 | Saginaw, Clinton | none |
| Hillsdale | 29 Oct 1829 | Lenawee | none |
| Houghton | 09 Mar 1845 | Chippewa | Baraga 1875, Keweenaw 1861, Ontonagon 1848, Schoolcraft 1848 |
| Huron | 01 Apr 1840 | Saginaw, St. Clair, Sanilac | none |
| Ingham | 29 Oct 1829 | Washtenaw, Eaton, Jackson | none |
| Ionia | 02 Mar 1831 | Kent | Montcalm 1831 |
| Iosco | 08 Mar 1843 | renamed from Kanotin | Ogemaw 1875 |
| Iowa | 09 Oct 1829 | Michigan Territory | now in State of Wisconsin |
| Iron | 03 Apr 1885 | Marquette, Menominee | none |
| Isabella | 02 Mar 1831 | Saginaw, Midland | Clare 1871 |
| Isle Royal | 1875 | Keweenaw | dissolved 1897, part of Keweenaw |
| Jackson | 29 Oct 1829 | Washtenaw | none |
| Kalamazoo | 29 Oct 1829 | St. Joseph | Allegan 1835, Barry 1829, Calhoun 1829, Eaton 1829, Kent 1836 |
| Kalkaska | 08 Mar 1843 | renamed from Wabasee | none |
| Kanotin | 01 Apr 1840 | Michigan Territory | renamed Iosco 1843 |
| Kautawaubet | 01 Apr 1840 | Michigan Territory | renamed Wexford 1843 |
| Kaykakee | 01 Apr 1840 | Michigan Territory | renamed Clare 1843 |
| Kent | 02 Mar 1831 | Kalamazoo | Clinton 1839, Ionia 1831, Mecosta 1859, Newaygo 1840, Ottawa 1837 |
| Keweenaw | 11 Mar 1861 | Houghton, Iowa | Isle Royal (dissolved 1897) |
| Lake | 08 Mar 1843 | renamed from Aishcum | none |
| Lapeer | 10 Sep 1822 | Oakland | Sanilac 1848 |
| Leelanau | 01 Apr 1840 | Grand Traverse | Benzie 1863 |
| Lenawee | 10 Sep 1822 | Indian lands | Cass 1829, Hillsdale 1835 |
| Livingston | 24 Mar 1836 | Shiawassee, Washtenaw | none |
| Luce | 01 Mar 1887 | Chippewa, Mackinac | none |
| Mackinac | 08 Mar 1843 | renamed from Michilimackinac | Cheboygan 1840, Chippewa 1826, Emmet 1853, Grand Traverse 1840, Luce 1887, Manistee 1855, Otsego 1840 |
| Macomb | 11 Mar 1818 | Wayne | none |
| Manistee | 01 Apr 1840 | Mackinac, Ottawa, Oceana | none |
| Manitou | 13 Feb 1855 | Michigan Territory | dissolved 1895 |
| Marquette | 09 Mar 1843 | Schoolcraft | Dickinson 1891, Iron 1885, Menominee 1863, Washington 1867 |
| Mason | 08 Mar 1843 | renamed from Notipekago | Lake 1871, Osceola 1869 |
| Mecosta | 01 Apr 1840 | Kent, Newaygo | Clare 1871, Osceola 1869 |
| Meegisee | 01 Apr 1840 | Michigan Territory | renamed Antrim 1843 |
| Menominee | 19 Mar 1863 | renamed from Bleeker 1861 | Dickinson 1891, Iron 1885 |
| Michilimackinac | 26 Oct 1818 | Michigan Territory | renamed Mackinac 1843 |
| Midland | 02 Mar 1831 | Saginaw | Bay 1857, Clare 1871, Gladwin 1855, Isabella 1831, Ogemaw 1875 |
| Mikensauk | 01 Apr 1840 | Michigan Territory | renamed Roscommon 1843 |
| Milwaukee | 06 Sep 1834 | Michigan Territory | now in State of Wisconsin |
| Monroe | 14 Jul 1817 | Wayne | none |
| Montcalm | 02 Mar 1831 | Ionia | none |
| Montmorency | 08 Mar 1843 | renamed from Cheonoguet | none |
| Muskegon | 04 Feb1 859 | Ottawa, Newaygo | none |
| Negwegon (old) | 01 Apr 1840 | Michigan Territory | renamed Alcona 1843 |
| Newaygo | 01 Ap 1840 | Kent, Muskegon, Oceana | Lake 1871, Mecosta 1854, Osceola 1869, Muskegon 1859 |
| Notipekago | 01 Apr 1840 | Michigan Territory | renamed Mason 1843 |
| Oakland | 12 Jan 1819 | Michigan Territory | Genesee 1836, lapeer 1835, Sanilac 1848, Saginaw 1822, Shaiwassee 1822 |
| Oceana | 02 Mar 1831 | Ottawa | Lake 1871, Manistee 1855, Mason 1855, Newaygo 1840 |
| Ogemaw | 27 Feb 1875 | Cheboygan, Midland, Iosco | none |
| Okkado | 01 Apr 1840 | Michigan Territory | renamed Otsego 1843 |
| Ontonagon | 03 Apr 1848 | Chippewa, Houghton | Gogebic 1881 |
| Osceola | 08 Mar 1843 | renamed from Unwattin | none |
| Oscoda | 01 Apr 1840 | Michigan Territory | none |
| Otsego | 08 Mar 1843 | renamed from Okkado | none |
| Ottawa | 02 Mar 1831 | Kent | Manistee 1855, Mason 1855 |
| Presque Isle | 01 Apr 1840 | Michigan Territory | none |
| Reshkaiko | 01 Apr 1840 | Michigan Territory | renamed Charlevoix 1843 |
| Roscommon | 08 Mar 1843 | renamed from Mikenauk | none |
| Saginaw | 10 Sep 1822 | Oakland | Arenac 1883, Bay 1857, Gladwin 1855, Gratiot 1855, Huron 1840, Iosco 1857, Isabella 1831, Midland 1850 |
| St. Clair | 10 Sep 1820 | Wayne | Huron 1840, Sanilac 1848 |
| St. Joseph | 29 Oct 1829 | Wayne | Barry 1829, Calhoun 1829, Eaton 1829, Kalamazoo 1829 |
| Sanilac | 10 Sep 1822 | Oakland, St. Clair, Lapeer | Huron 1840, Tuscola 1850 |
| Schoolcraft | 09 Mar 1843 | Chippewa, Houghton | Alger 1855, Delta 1861, Marquette 1851 |
| Shawano | 26 Oct 1818 | Michigan Territory | now in State of Wisconsin |
| Shiawassee | 10 Sep 1822 | Oakland, Genesee | Clitnon 1839, Livingston 1836 |
| Tonedagana | 01 Apr 1840 | Michigan Territory | renamed Emmet 1843 |
| Tuscola | 01 Apr 1840 | Sanilac | none |
| Unwattin | 01 Apr 1840 | Michigan Territory | renamed Osceola 1843 |
| Van Buren | 29 Oct 1829 | Cass | none |
| Wabasee | 01 Apr 1840 | Michigan Territory | renamed Kalkaska 1843 |
| Washtenaw | 20 Nov 1822 | Wayne | Livingston 1836, Ingahm 1829, Jackson 1832 |
| Wayne | 18 Aug 1796 | Northwest Territory | Michilimackinac 1818, Macomb 1818, Monroe 1817, St. Clair 1820, St. Joseph 1820, Washtenaw 1826 |
| Wexford | 08 Mar 1843 | renamed from Kautawaubet | none |
| Wyandotte | 01 Apr 1840 | Michigan Territory | none |