Ohio has eighty-eight (88) counties the first of which was formed in 1788 from unorgaized territory.  Counties with links have ALHN sites online; all others are available for adoption.  If you would like to host a county in the Ohio ALHN send an email to me at .  Before writing you might want to review the Requirments for New Hosts/Coordinators.
COUNTY COUNTY SEAT YEAR ORGANIZED
PARENT COUNTIES
ADAMS
Adopt me!
West Union 1797
Hamilton-Washington
ALLEN
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Lima 1820
Shelby-Logan-Mercer
ASHLAND
Adopt me!
Ashland 1846
Huron-Lorain-Richland-Wayne
ASHTABULA
Adopt me!
Jefferson
1808
Geauga-Trumbull
ATHENS
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Athens 1805
Washington
AUGLAIZE
Adopt me!
Wapakoneta 1848
Allen-Mercer
BELMONT
Adopt me!
St. Clairsville 1801
Jefferson-Washington
BROWN
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Georgetown 1818
Adams-Clermont
BUTLER
Debbie Hund
Hamilton 1803
CARROLL
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Carrolton 1833
Columbiana-Harrison-Jefferson-Stark-Tuscarawas
CHAMPAIGN
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Urbana 1805
Franklin-Greene
CLARK
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Springfield 1818
Champaign-Greene-Madison
CLERMONT
Tammy Collins Altman
Batavia 1800
Hamilton
CLINTON
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Wilmington 1810
Highland-Warren
COLUMBIANA
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Lisbon 1803
Jefferson
COSHOCTON
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Coshocton 1810
Muskingum-Tuscarawas
CRAWFORD
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Bucyrus 1820
Delaware
CUYAHOGA
Denise Wells
Cleveland 1808
Geauga
DARKE
Wally Garchow
Greenville 1808
Miami
DEFIANCE
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Defiance 1845
Henry-Paulding-Williams
DELAWARE
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Delaware 1808
Franklin
ERIE
Adopt me!
Sandusky 1838
Huron-Sandusky
FAIRFIELD
Denise Woodside
Lancaster 1800
Ross-Washington
FAYETTE
Nancy M. Dickinson
Washington Court House 1810
Highland-Ross
FRANKLIN
Leona L. Gustafson
Columbus 1803
Ross-Unorganized territory
FULTON
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Wauseon 1850
Henry-Lucas-Williams
GALLIA
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Gallipolis 1803
Washington
GEAUGA
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Chardon 1806
Trumbull
GREENE
Dale Grimm
Xenia 1803
Hamilton-Ross
GUERNSEY
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Cambridge 1810
Belmont-Muskingum
HAMILTON
Linda Boorom
Cincinnati 1790
Original county
HANCOCK
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Findlay 1820
Logan-Delaware
HARDIN
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Kenton 1820
Logan-Delaware
HARRISON
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Cadiz 1813
Jefferson-Tuscarawas
HENRY
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Napoleon 1820
Logan-Shelby
HIGHLAND
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Hillsboro 1805
Adams-Clermont-Ross
HOCKING
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Logan 1818
Athens-Ross-Fairfield
HOLMES
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Millersburg 1824
Coshocton-Tuscarawas-Wayne
HURON
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Norwalk 1809
Portage-Geauga
JACKSON
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Jackson 1816
Athens-Gallia-Ross-Scioto
JEFFERSON
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Steubenville 1797
Washington
KNOX
Nola Miles Rogers
Mt. Vernon 1808
Fairfield-Franklin
LAKE
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Painsville 1840
Cuyahoga-Geauga
LAWRENCE
Adopt me!
Ironton 1815
Gallia-Scioto
LICKING
Nola Miles Rogers
Licking Valley Heritage Society
Newark 1808
Fairfield
LOGAN
Robert V. Bremer
Bellefontaine 1818
Champaign
LORAIN
Adopt me!
Elyria 1822
Cuyahoga-Huron-Medina
LUCAS
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Toledo 1835
Wood-Sandusky
MADISON
Dale Grimm
London 1810
Franklin
MAHONING
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Youngstown 1846
Columbiana-Trumbull
MARION
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Marion 1820
Delaware
MEDINA
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Medina 1812
Portage
MEIGS
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Pomeroy 1819
Athens-Gallia
MERCER
Wally Garchow
Celina 1820
Darke-Shelby
MIAMI
Adopt me!
Troy 1807
Montgomery
MONROE
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Woodsfield 1813
Belmont-Guernsey-Washington
MONTGOMERY
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Dayton 1803
Hamilton
MORGAN
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McConnelsville 1817
Guernsey-Muskingum-Washington
MORROW
Adopt me!
Mt. Gilead 1848
Delaware-Knox-Marion-Richland
MUSKINGUM
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Zanesville 1804
Fairfield-Washington
NOBLE
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Caldwell 1851
Guernsey-Monroe-Morgan-Washington
OTTAWA
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Port Clinton 1840
Erie-Lucas-Sandusky
PAULDING
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Paulding 1820
Shelby-Darke
PERRY
Adopt me!
New Lexington 1818
Fairfield-Muskingum-Washington
PICKAWAY
Adopt me!
Circleville 1810
Fairfield-Franklin-Ross
PIKE
Adopt me!
Waverly 1815
Adams-Ross-Scioto
PORTAGE
Jeff Farmer
Ravenna 1808
Trumbull
PREBLE
Wally Garchow
Eaton 1808
Butler-Montgomery
PUTNAM
Cheryl A. Bechtel
Ottawa 1820
Shelby-Logan
RICHLAND
Adopt me!
Mansfield 1808
Franklin
ROSS
Adopt me!
Chillicothe 1798
Adams-Hamilton-Washington
SANDUSKY
Adopt me!
Fremont 1820
Huron
SCIOTO
Adopt me!
Portsmouth 1803
Adams
SENECA
Adopt me!
Tiffin 1820
Huron-Sandusky
SHELBY
Tina Hursh
Sidney 1819
Miami
STARK
Adopt me!
Canton 1808
Columbiana-Muskingum
SUMMIT
Adopt me!
Akron 1840
Medina-Portage-Stark
TRUMBULL
Peggy Tebbetts
Warren 1800
Jefferson-Wayne (Northwest Territory)
TUSCARAWAS
Adopt me!
New Philadelphia 1808
Muskingum
UNION
Robert V. Bremer
Union County Genealogical Society NEW URL!
Town site: Chuckery, Ohio
Rebekah Headings
Marysville 1820
Delaware-Franklin-Logan-Madison
VAN WERT
Adopt me!
Van Wert 1820
Darke-Shelby
VINTON
Adopt me!
McArthur 1850
Athens-Gallia-Hocking-Jackson-Ross
WARREN
Adopt me!
Lebanon 1803
Hamilton
WASHINGTON
Adopt me!
Marietta 1788
Unorganized territory
WAYNE
Adopt me!
Wooster 1808
Columbiana-Stark
WILLIAMS
Adopt me!
Bryan 1820
Darke-Shelby
WOOD
Adopt me!
Bowling Green 1820
Logan
WYANDOT
Adopt me!
Upper Sandusky 1845
Crawford-Hancock-Hardin-Marion


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