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County	Date Created	Date Organized	Parent County	County Seat
ALCONA	1 Apr 1840	12 Mar 1869	Alpena, Cheboygan	HARRISVILLE
ALGER	17 Mar 1885	17 Mar 1885	Schoolcraft	MUNISING
ALLEGAN	2 Mar 1831	7 Sept1835	Kalamazoo	ALLEGAN
ALPENA	1 Apr 1840	7 Feb 1857	Cheboygan	ALPENA
ANTRIM	1 Apr 1840	11 Mar 1863	Grand Traverse	BELLAIRE
ARENAC	21 Apr 1883	21 Apr 1883	Bay, Saginaw	STANDISH
BARAGA	19 Feb 1875	19 Feb 1875	Houghton	L'ANSE
BARRY	29 Oct 1829	15 Mar 1839	St. Joseph, Kalamazoo	HASTINGS
BAY	20 Apr 1857	20 Apr 1857	Saginaw, Midland	BAY CITY
BENZIE	27 Feb 1863	30 Mar 1869	Grand Traverse, Leelanau	BEULAH
BERRIEN	29 Oct 1829	1Sept1831	Cass	SAINT JOSEPH
BRANCH	29 Oct 1829	1 Mar 1833	St. Joseph, Lenawee	COLDWATER
CALHOUN	29 Oct 1829	1 Apr 1833	St. Joseph, Kalamazoo	MARSHALL
CASS	29 Oct 1829	29 Oct 1829	Lenawee	CASSOPOLIS
CHARLEVOIX	2 Apr 1869	2 Apr 1869	Emmet	CHARLEVOIX
CHEBOYGAN	1 Apr 1840	29 Jan 1853	Mackinac	CHEBOYGAN
CHIPPEWA	1 Feb 1827	1 Feb 1827	Mackinac	SAULT SAINTE MARIE
CLARE	1 Apr 1840	13 Mar 1871	Isabella, Midland, Mecosta	HARRISON
CLINTON	2 Mar 1831	2 Mar 1831	Shiawassee, Kent	SAINT JOHNS
CRAWFORD	1 Apr 1840	22 Mar 1879	Cheboygan, Antrim, Kalkaska	GRAYLING
DELTA	9 Mar 1843	12 Mar 1861	Mackinac	ESCANABA
DICKINSON	21 May 1891	21 May 1891	Marquette, Menominee	IRON MOUNTAIN
EATON	29 Oct 1829	29 Dec 1837	St. Joseph, Kalamazoo, Calhoun	CHARLOTTE
EMMET	1 Apr 1840	29 Jan 1853	Mackinac	PETOSKEY
GENESEE	28 Mar 1835	28 Mar 1835	Lapeer	FLINT
GLADWIN	2 Mar 1831	18 Apr 1875	Saginaw, Midland	GLADWIN
GOGEBIC	7 Feb 1887	7 Feb 1887	Ontonagon	BESSEMER
GRAND TRAVERSE	7 Apr 1851	7 Apr 1851	Mackinac	TRAVERSE CITY
GRATIOT	2 Mar 1831	3 Feb 1855	Saginaw, Clinton	ITHACA
HILLSDALE	29 Oct 1829	11 Feb 1835	Lenawee	HILLSDALE
HOUGHTON	19 Mar 1845	18 May 1846	Marquette, Schoolcraft, Ontonagon	HOUGHTON
HURON	1 Apr 1840	25 Jan 1859	Saginaw, St. Clair, Sanilac	BADAXE
INGHAM	29 Oct 1829	4 Jun 1838	Washtenaw, Jackson, Eaton	MASON
IONIA	2 Mar 1831	3 Apr 1837	Kent	IONIA
IOSCO	1 Apr 1840	16 Feb 1857	Saginaw, Cheboygan	TAWAS CITY
IRON	3 Apr 1885	3 Apr 1885	Marquette, Menominee	CRYSTAL FALLS
ISABELLA	2 Mar 1831	11 Feb 1859	Saginaw, Midland	MOUNT PLEASANT
JACKSON	29 Oct 1829	1 Aug 1832	Washtenaw	JACKSON
KALAMAZOO	29 Oct 1829	1 Oct 1830	St. Joseph	KALAMAZOO
KALKASKA	1 Apr 1840	27 Jan 1871	Grand Traverse, Antrim	KALKASKA
KENT	2 Mar 1831	4 Apr 1836	Kalamazoo	GRAND RAPIDS
KEWEENAW	11 Mar 1861	11 Mar 1861	Houghton	EAGLE RIVER
LAKE	1 Apr 1840	1 May 1871	Oceana, Mason, Newaygo	BALDWIN
LAPEER	10 Sep 1822	2 Feb 1835	Oakland	LAPEER
LEELANAU	1 Apr 1840	27 Feb 1863	Grand Traverse	LELAND
LENAWEE	10 Sep 1822	31 Dec 1826	Wayne	ADRIAN
LIVINGSTON	21 Mar 1833	4 Apr 1836	Shiawassee, Washtenaw	HOWELL
LUCE	1 Mar 1887	1 Mar 1887	Chippewa, Mackinac	NEWBERRY
MACKINAC	26 Oct 1818	26 Jan 1837	Wayne and the French	SAINT IGNACE
MACOMB	15 Jan 1818	15 Jan 1818	Wayne	MOUNT CLEMENS
MANISTEE	1 Apr 1840	13 Feb 1855	Mackinac, Ottawa, Oceana, Grand Traverse	MANISTEE
MARQUETTE	9 Mar 1843	1 Dec 1851	Chippewa, Houghton	MARQUETTE
MASON	1 Apr 1840	13 Feb 1855	Ottawa, Oceana	LUDINGTON
MECOSTA	1 Apr 1840	11 Feb 1858	Newaygo	BIGRAPIDS
MENOMINEE	15 Mar 1861	15 Mar 1861	Marquette	MENOMINEE
MIDLAND	2 Mar 1831	31 Dec 1850	Saginaw	MIDLAND
MISSAUKEE	1 Apr 1840	11 Mar 1871	Antrim, Grand Traverse	LAKE CITY
MONROE	14 Jul 1817	14 Jul 1817	Wayne	MONROE
MONTCALM	2 Mar 1831	20 Mar 1850	Ionia	STANTON
MONTMORENCY	1 Apr 1840	21 May 1881	Cheboygan, Alpena	ATLANTA
MUSKEGON	4 Feb 1859	4 Feb 1859	Ottawa	MUSKEGON
NEWAYGO	1 Apr 1840	27 Jan 1851	Kent, Muskegon, Oceana	WHITE CLOUD
OAKLAND	12 Jan 1819	28 Mar 1820	Wayne	PONTIAC
OCEANA	2 Mar 1831	7 Apr 1851	Ottawa	HART
OGEMAW	1 Apr 1840	27 Apr 1875	Saginaw, Branch	WEST BRANCH
ONTONAGON	9 Mar 1843	1 Jan 1853	Chippewa, Houghton	ONTONAGON
OSCEOLA	1 Apr 1840	17 Mar 1869	Mason, Newaygo, Mecosta	REED CITY
OSCODA	1 Apr 1840	10 Mar 1881	Cheboygan, Alpena, Alcona	MIO
OTSEGO	1 Apr 1840	12 Mar 1875	Michilimackinac	GAYLORD
OTTAWA	2 Mar 1831	19 Dec 1837	Kent	GRAND HAVEN
PRESQUE ISLE	1 Apr 1840	31 Mar 1871	Mackinac	ROGERS CITY
ROSCOMMON	1 Apr 1840	20 Mar 1875	Cheboygan, Midland	ROSCOMMON
SAGINAW	10 Sep 1822	9 Feb 1835	Oakland	SAGINAW
SAINT CLAIR	28 Mar 1820	8 May 1821	Wayne	PORT HURON
SAINT JOSEPH	29 Oct 1829	29 Oct 1829	Wayne	CENTREVILLE
SANILAC	10 Sep 1822	31 Dec 1849	Oakland, St. Clair, Lapeer	SANDUSKY
SCHOOLCRAFT	9 Mar 1843	23 Mar 1871	Chippewa, Houghton, Marquette	MANISTIQUE
SHIAWASSEE	10 Sep 1822	18 Mar 1837	Oakland, Genesee	CORUNNA
TUSCOLA	1 Apr 1840	2 Mar 1850	Saginaw	CARO
VAN BUREN	29 Oct 1829	3 Apr 1837	Cass	PAW PAW
WASHTENAW	10 Sep 1822	31 Dec 1826	Wayne, Oakland	ANN ARBOR
WAYNE	21 Nov 1815	21 Nov 1815	Original County	DETROIT
WEXFORD	1 Apr 1840	30 Mar 1869	Manistee	CADILLAC

Data in the above table collected by Donna Hoff-Grambau.