New Horizons Genealogy

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Search Free Ohio Genealogy and Family History Records Online including census, cemetery, vital, military and other genealogical and historical records that can be used for your family history research.

Our Ohio genealogy and family history page is a place where you can come in and research your genealogy and family history. We also do our best to provide a history of the area, to provide you with an overview of the time in which your ancestors lived.

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Ohio Genealogy by County

CountyCounty SeatFormedOrigin
Adams CountyWest UnionJuly 10, 1797Hamilton County
Allen CountyLimaMarch 1, 1820Shelby County
Ashland CountyAshlandFebruary 24, 1846Wayne, Richland, Huron, and Lorain Counties
Ashtabula CountyJeffersonJune 7, 1807Trumbull and Geauga Counties
Athens CountyAthensMarch 1, 1805Washington County
Auglaize CountyWapakonetaFebruary 14, 1848Allen, Mercer, Darke, Hardin, Logan, Shelby, and Van Wert Counties
Belmont CountySt. ClairsvilleSeptember 7, 1801Jefferson and Washington Counties
Brown CountyGeorgetownMarch 1, 1818Adams and Clermont Counties
Butler CountyHamiltonMay 1, 1803Hamilton County
Carroll CountyCarrolltonJanuary 1, 1833Columbiana, Stark, Harrison, Jefferson, and Tuscarawas Counties
Champaign CountyUrbanaMarch 1, 1805Greene and Franklin Counties
Clark CountySpringfieldMarch 1, 1818Champaign, Madison, and Greene Counties
Clermont CountyBataviaDecember 6, 1800Hamilton County
Clinton CountyWilmingtonMarch 1, 1810Highland and Warren Counties
Columbiana CountyLisbonMay 1, 1803Jefferson and Washington Counties
Coshocton CountyCoshoctonJanuary 31, 1810Muskingum and Tuscarawas Counties
Crawford CountyBucyrusApril 1, 1820Delaware County
Cuyahoga CountyClevelandJune 7, 1807Geauga County
Darke CountyGreenvilleJanuary 3, 1809Miami County
Defiance CountyDefianceApril 7, 1845Williams, Henry, and Paulding Counties
Delaware CountyDelawareApril 1, 1808Franklin County
Erie CountySanduskyMarch 15, 1838Huron and Sandusky Counties
Fairfield CountyLancasterDecember 9, 1800Ross and Washington Counties
Fayette CountyWashington Court HouseMarch 1, 1810Ross and Highland Counties
Franklin CountyColumbusApril 30, 1803Ross and Wayne Counties
Fulton CountyWauseonApril 1, 1850Lucas, Henry, and Williams Counties
Gallia CountyGallipolisApril 30, 1803Washington and Adams Counties
Geauga CountyChardonMarch 1, 1806Trumbull County
Greene CountyXeniaMay 1, 1803Hamilton and Ross Counties
Guernsey CountyCambridgeMarch 1, 1810Belmont and Muskingum Counties
Hamilton CountyCincinnatiJanuary 2, 1790One of the original counties
Hancock CountyFindlayApril 1, 1820Logan County
Hardin CountyKentonApril 1, 1820Logan County
Harrison CountyCadizFebruary 1, 1813Jefferson and Tuscarawas Counties
Henry CountyNapoleonApril 1, 1820Shelby County
Highland CountyHillsboroMay 1, 1805Ross, Adams, and Clermont Counties
Hocking CountyLoganMarch 1, 1818Athens, Ross, and Fairfield Counties
Holmes CountyMillersburgJanuary 20, 1824Coshocton, Wayne, and Tuscarawas Counties
Huron CountyNorwalkMarch 7, 1809Portage and Cuyahoga Counties
Jackson CountyJacksonMarch 1, 1816Scioto, Gallia, Athens, and Ross Counties
Jefferson CountySteubenvilleJuly 29, 1797Washington County
Knox CountyMount VernonMarch 1, 1808Fairfield County
Lake CountyPainesvilleMarch 6, 1840Geauga and Cuyahoga Counties
Lawrence CountyIrontonDecember 21, 1815Gallia and Scioto Counties
Licking CountyNewarkMarch 1, 1808Fairfield County
Logan CountyBellefontaineMarch 1, 1818Champaign County
Lorain CountyElyriaDecember 26, 1822Huron, Cuyahoga, and Medina Counties
Lucas CountyToledoJune 20, 1835Wood, Sandusky, and Huron Counties
Madison CountyLondonMarch 1, 1810Franklin County
Mahoning CountyYoungstownMarch 1, 1846Columbiana and Trumbull Counties
Marion CountyMarionApril 1, 1820Delaware County
Medina CountyMedinaFebruary 18, 1812Portage County
Meigs CountyPomeroyApril 1, 1819Gallia and Athens Counties
Mercer CountyCelinaApril 1, 1820Darke County
Miami CountyTroyMarch 1, 1807Montgomery County
Monroe CountyWoodsfieldJanuary 29, 1813Belmont, Washington, and Guernsey Counties
Montgomery CountyDaytonMay 1, 1803Hamilton and Wayne Counties
Morgan CountyMcConnelsvilleDecember 29, 1817Washington, Guernsey, and Muskingum Counties
Morrow CountyMount GileadMarch 1, 1848Knox, Marion, Delaware, and Richland Counties
Muskingum CountyZanesvilleMarch 1, 1804[16][17]Washington and Fairfield Counties
Noble CountyCaldwellApril 1, 1851Monroe, Washington, Morgan, and Guernsey Counties
Ottawa CountyPort ClintonMarch 6, 1840Erie, Sandusky, and Lucas Counties
Paulding CountyPauldingApril 1, 1820Darke County
Perry CountyNew LexingtonMarch 1, 1818Washington, Fairfield, and Muskingum Counties
Pickaway CountyCirclevilleMarch 1, 1810Ross, Fairfield, and Franklin Counties
Pike CountyWaverlyFebruary 1, 1815Ross, Scioto, and Adams Counties
Portage CountyRavennaJune 7, 1807Trumbull County
Preble CountyEatonMarch 1, 1808Montgomery and Butler Counties
Putnam CountyOttawaApril 1, 1820Shelby County
Richland CountyMansfieldMarch 1, 1808Fairfield County
Ross CountyChillicotheAugust 20, 1798Adams and Washington Counties
Sandusky CountyFremontApril 1, 1820Huron County
Scioto CountyPortsmouthMay 1, 1803Adams County
Seneca CountyTiffinApril 1, 1820Huron County
Shelby CountySidneyApril 1, 1819Miami County
Stark CountyCantonFebruary 13, 1808Columbiana County
Summit CountyAkronMarch 3, 1840Medina, Portage, and Stark Counties
Trumbull CountyWarrenJuly 10, 1800Jefferson and Wayne Counties
Tuscarawas CountyNew PhiladelphiaMarch 15, 1808Muskingum County
Union CountyMarysvilleApril 1, 1820Delaware, Franklin, Logan, and Madison Counties
Van Wert CountyVan WertApril 1, 1820Darke County
Vinton CountyMcArthurMarch 23, 1850Athens, Gallia, Hocking, Jackson, and Ross Counties
Warren CountyLebanonMay 1, 1803Hamilton County
Washington CountyMariettaJuly 27, 1788One of the original counties
Wayne CountyWoosterMarch 1, 1808From non-county area
Williams CountyBryanApril 1, 1820Darke County
Wood CountyBowling GreenApril 1, 1820Refactored from non-county territory
Wyandot CountyUpper SanduskyFebruary 3, 1845Marion, Crawford, and Hardin Counties

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