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• Adams County [19]
• Allen County [7]
• Ashland County [8]
• Ashtabula County [13]
• Athens County [10]
• Auglaize County [10]
• Belmont County [21]
• Brown County [12]
• Butler County [48]
• Carroll County [3]
• Champaign County [35]
• Clark County [9]
• Clermont County [12]
• Clinton County [13]
• Columbiana County [19]
• Coshocton County [9]
• Crawford County [9]
• Cuyahoga County [145]
• Darke County [7]
• Defiance County [7]
• Delaware County [21]
• Erie County [34]
• Fairfield County [11]
• Fayette County [8]
• Franklin County [123]
• Fulton County [5]
• Gallia County [21]
• Geauga County [19]
• Greene County [29]
• Guernsey County [6]
• Hamilton County [92]
• Hancock County [22]
• Hardin County [16]
• Harrison County [4]
• Henry County [6]
• Highland County [8]
• Hocking County [7]
• Holmes County [4]
• Huron County [8]
• Jackson County [11]
• Jefferson County [13]
• Knox County [16]
• Lake County [26]
• Lawrence County [9]
• Licking County [30]
• Logan County [14]
• Lorain County [35]
• Lucas County [67]
• Madison County [3]
• Mahoning County [46]
• Marion County [17]
  • 1-51 Home of Warren G. Harding [0]
  • 2-51 Boyhood Home of Warren G. Harding [0]
  • 3-51 Jacob's Well [0]
  • 4-51 Claridon Prairie [0]
  • 5-51 Norman Mattoon Thomas [0]
  • 6-51 Marion County Courthouse [0]
  • 7-51 Home of the Oorang Indians, NFL's Most Colorful Franchise [0]
  • 8-51 The "Old Blockhouse" Site [0]
  • 9-51 World War II Displacement [0]
  • 10-51 Harrison Military Road, War of 1812 [0]
  • 11-51 Marion Mausoleum [0]
  • 12-51 The Marion Engineer Depot [0]
  • 13-51 Marion Steam Shovel [0]
  • 14-51 Camp Marion, World War II Prisoners of War, 1944-1946 [0]
  • 15-51 Scioto Ordnance Plant Site [0]
  • 16-51 Cummin's Home [0]
  • 17-51 Old Marion Cemetery [0]
• Medina County [13]
• Meigs County [20]
• Mercer County [5]
• Miami County [33]
• Monroe County [6]
• Montgomery County [36]
• Morgan County [20]
• Morrow County [4]
• Muskingum County [17]
• Noble County [3]
• Ottawa County [20]
• Paulding County [5]
• Perry County [15]
• Pickaway County [11]
• Pike County [7]
• Portage County [18]
• Preble County [9]
• Putnam County [6]
• Richland County [9]
• Ross County [16]
• Sandusky County [9]
• Scioto County [10]
• Seneca County [15]
• Shelby County [5]
• Stark County [27]
• Summit County [48]
• Trumbull County [37]
• Tuscarawas County [31]
• Union County [23]
• Van Wert County [6]
• Vinton County [3]
• Warren County [22]
• Washington County [24]
• Wayne County [10]
• Williams County [10]
• Wood County [23]
• Wyandot County [7]

Total markers: 1730