INDEX: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
| County ⬍ | Day Created ⬍ | Month Created ⬍ | Year Created ⬍ | Day Organized ⬍ | Month Organized ⬍ | Year Organized ⬍ | Parent County ⬍ | County Seat ⬍ |
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| ALCONA | 01 | 04 | 1840 | 12 | 03 | 1869 | Alpena, Cheboygan | Harrisville |
| ALGER | 17 | 03 | 1885 | 17 | 03 | 1885 | Schoolcraft | Munising |
| ALLEGAN | 02 | 03 | 1831 | 07 | 09 | 1835 | Kalamazoo | Allegan |
| ALPENA | 01 | 04 | 1840 | 07 | 02 | 1857 | Cheboygan | Alpena |
| ANTRIM | 01 | 04 | 1840 | 11 | 03 | 1863 | Grand Traverse | Bellaire |
| ARENAC | 21 | 04 | 1883 | 21 | 04 | 1883 | Bay, Saginaw | Standish |
| BARAGA | 19 | 02 | 1875 | 19 | 02 | 1875 | Houghton | L'anse |
| BARRY | 29 | 10 | 1829 | 15 | 03 | 1839 | St. Joseph, Kalamazoo | Hastings |
| BAY | 20 | 04 | 1857 | 20 | 04 | 1857 | Saginaw, Midland | Bay City |
| BENZIE | 27 | 02 | 1863 | 30 | 03 | 1869 | Grand Traverse, Leelanau | Beulah |
| BERRIEN | 29 | 10 | 1829 | 01 | 09 | 1831 | Cass | Saint Joseph |
| BRANCH | 29 | 10 | 1829 | 01 | 03 | 1833 | St. Joseph, Lenawee | Coldwater |
| CALHOUN | 29 | 10 | 1829 | 01 | 04 | 1833 | St. Joseph, Kalamazoo | Marshall |
| CASS | 29 | 10 | 1829 | 29 | 10 | 1829 | Lenawee | Cassopolis |
| CHARLEVOIX | 02 | 04 | 1869 | 02 | 04 | 1869 | Emmet | Charlevoix |
| CHEBOYGAN | 01 | 04 | 1840 | 29 | 01 | 1853 | Mackinac | Cheboygan |
| CHIPPEWA | 01 | 02 | 1827 | 01 | 02 | 1827 | Mackinac | Sault Sainte Marie |
| CLARE | 01 | 04 | 1840 | 13 | 03 | 1871 | Isabella, Midland, Mecosta | Harrison |
| CLINTON | 02 | 03 | 1831 | 02 | 03 | 1831 | Shiawassee, Kent | Saint Johns |
| CRAWFORD | 01 | 04 | 1840 | 22 | 03 | 1879 | Cheboygan, Antrim, Kalkaska | Grayling |
| DELTA | 09 | 03 | 1843 | 12 | 03 | 1861 | Mackinac | Escanaba |
| DICKINSON | 21 | 05 | 1891 | 21 | 05 | 1891 | Marquette, Menominee | Iron Mountain |
| EATON | 29 | 10 | 1829 | 29 | 12 | 1837 | St. Joseph, Kalamazoo, Calhoun | Charlotte |
| EMMET | 01 | 04 | 1840 | 29 | 01 | 1853 | Mackinac | Petoskey |
| GENESEE | 28 | 03 | 1835 | 28 | 03 | 1835 | Lapeer | Flint |
| GLADWIN | 02 | 03 | 1831 | 18 | 04 | 1875 | Saginaw, Midland | Gladwin |
| GOGEBIC | 07 | 02 | 1887 | 07 | 02 | 1887 | Ontonagon | Bessemer |
| GRAND TRAVERSE | 07 | 04 | 1851 | 07 | 04 | 1851 | Mackinac | Traverse City |
| GRATIOT | 02 | 03 | 1831 | 03 | 02 | 1855 | Saginaw, Clinton | Ithaca |
| HILLSDALE | 29 | 10 | 1829 | 11 | 02 | 1835 | Lenawee | Hillsdale |
| HOUGHTON | 19 | 03 | 1845 | 18 | 05 | 1846 | Marquette, Schoolcraft, Ontonagon | Houghton |
| HURON | 01 | 04 | 1840 | 25 | 01 | 1859 | Saginaw, St. Clair, Sanilac | Badaxe |
| INGHAM | 29 | 10 | 1829 | 04 | 06 | 1838 | Washtenaw, Jackson, Eaton | Mason |
| IONIA | 02 | 03 | 1831 | 03 | 04 | 1837 | Kent | Ionia |
| IOSCO | 01 | 04 | 1840 | 16 | 02 | 1857 | Saginaw, Cheboygan | Tawas City |
| IRON | 03 | 04 | 1885 | 03 | 04 | 1885 | Marquette, Menominee | Crystal Falls |
| ISABELLA | 02 | 03 | 1831 | 11 | 02 | 1859 | Saginaw, Midland | Mount Pleasant |
| JACKSON | 29 | 10 | 1829 | 01 | 08 | 1832 | Washtenaw | Jackson |
| KALAMAZOO | 29 | 10 | 1829 | 01 | 10 | 1830 | St. Joseph | Kalamazoo |
| KALKASKA | 01 | 04 | 1840 | 27 | 01 | 1871 | Grand Traverse, Antrim | Kalkaska |
| KENT | 02 | 03 | 1831 | 04 | 04 | 1836 | Kalamazoo | Grand Rapids |
| KEWEENAW | 11 | 03 | 1861 | 11 | 03 | 1861 | Houghton | Eagle River |
| LAKE | 01 | 04 | 1840 | 01 | 05 | 1871 | Oceana, Mason, Newaygo | Baldwin |
| LAPEER | 10 | 09 | 1822 | 02 | 02 | 1835 | Oakland | Lapeer |
| LEELANAU | 01 | 04 | 1840 | 27 | 02 | 1863 | Grand Traverse | Leland |
| LENAWEE | 10 | 09 | 1822 | 31 | 12 | 1826 | Wayne | Adrian |
| LIVINGSTON | 21 | 03 | 1833 | 04 | 04 | 1836 | Shiawassee, Washtenaw | Howell |
| LUCE | 01 | 03 | 1887 | 01 | 03 | 1887 | Chippewa, Mackinac | Newberry |
| MACKINAC | 26 | 10 | 1818 | 26 | 01 | 1837 | Wayne and the French | Saint Ignace |
| MACOMB | 15 | 01 | 1818 | 15 | 01 | 1818 | Wayne | Mount Clemens |
| MANISTEE | 01 | 04 | 1840 | 13 | 02 | 1855 | Mackinac, Ottawa, Oceana, Grand Traverse | Manistee |
| MARQUETTE | 09 | 03 | 1843 | 01 | 12 | 1851 | Chippewa, Houghton | Marquette |
| MASON | 01 | 04 | 1840 | 13 | 02 | 1855 | Ottawa, Oceana | Ludington |
| MECOSTA | 01 | 04 | 1840 | 11 | 02 | 1858 | Newaygo | Bigrapids |
| MENOMINEE | 15 | 03 | 1861 | 15 | 03 | 1861 | Marquette | Menominee |
| MIDLAND | 02 | 03 | 1831 | 31 | 12 | 1850 | Saginaw | Midland |
| MISSAUKEE | 01 | 04 | 1840 | 11 | 03 | 1871 | Antrim, Grand Traverse | Lake City |
| MONROE | 14 | 07 | 1817 | 14 | 07 | 1817 | Wayne | Monroe |
| MONTCALM | 02 | 03 | 1831 | 20 | 03 | 1850 | Ionia | Stanton |
| MONTMORENCY | 01 | 04 | 1840 | 21 | 05 | 1881 | Cheboygan, Alpena | Atlanta |
| MUSKEGON | 04 | 02 | 1859 | 04 | 02 | 1859 | Ottawa | Muskegon |
| NEWAYGO | 01 | 04 | 1840 | 27 | 01 | 1851 | Kent, Muskegon, Oceana | White Cloud |
| OAKLAND | 12 | 01 | 1819 | 28 | 03 | 1820 | Wayne | Pontiac |
| OCEANA | 02 | 03 | 1831 | 07 | 04 | 1851 | Ottawa | Hart |
| OGEMAW | 01 | 04 | 1840 | 27 | 04 | 1875 | Saginaw, Branch | West Branch |
| ONTONAGON | 09 | 03 | 1843 | 01 | 01 | 1853 | Chippewa, Houghton | Ontonagon |
| OSCEOLA | 01 | 04 | 1840 | 17 | 03 | 1869 | Mason, Newaygo, Mecosta | Reed City |
| OSCODA | 01 | 04 | 1840 | 10 | 03 | 1881 | Cheboygan, Alpena, Alcona | Mio |
| OTSEGO | 01 | 04 | 1840 | 12 | 03 | 1875 | Michilimackinac | Gaylord |
| OTTAWA | 02 | 03 | 1831 | 19 | 12 | 1837 | Kent | Grand Haven |
| PRESQUE ISLE | 01 | 04 | 1840 | 31 | 03 | 1871 | Mackinac | Rogers City |
| ROSCOMMON | 01 | 04 | 1840 | 20 | 03 | 1875 | Cheboygan, Midland | Roscommon |
| SAGINAW | 10 | 09 | 1822 | 07 | 02 | 1835 | Oakland | Saginaw |
| SAINT CLAIR | 28 | 03 | 1820 | 07 | 05 | 1821 | Wayne | Port Huron |
| SAINT JOSEPH | 29 | 10 | 1829 | 29 | 10 | 1829 | Wayne | Centreville |
| SANILAC | 10 | 09 | 1822 | 31 | 12 | 1849 | Oakland, St. Clair, Lapeer | Sandusky |
| SCHOOLCRAFT | 09 | 03 | 1843 | 23 | 03 | 1871 | Chippewa, Houghton, Marquette | Manistique |
| SHIAWASSEE | 10 | 09 | 1822 | 18 | 03 | 1837 | Oakland, Genesee | Corunna |
| TUSCOLA | 01 | 04 | 1840 | 02 | 03 | 1850 | Saginaw | Caro |
| VAN BUREN | 29 | 10 | 1829 | 03 | 04 | 1837 | Cass | Paw Paw |
| WASHTENAW | 10 | 09 | 1822 | 31 | 12 | 1826 | Wayne, Oakland | Ann Arbor |
| WAYNE | 21 | 11 | 1815 | 21 | 11 | 1815 | Original County | Detroit |
| WEXFORD | 01 | 04 | 1840 | 30 | 03 | 1869 | Manistee | Cadillac |
| County ⬍ | Day Created ⬍ | Month Created ⬍ | Year Created ⬍ | Day Organize ⬍ | Month Organized ⬍ | Year Organized ⬍ | Parent County ⬍ | County Seat ⬍ |
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INDEX: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
Data in the above table collected by Donna Hoff-Grambau.
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