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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 [49]
• Carroll County [3]
• Champaign County [35]
• Clark County [9]
• Clermont County [12]
• Clinton County [13]
• Columbiana County [18]
  • 1-15 Church Hill Road Bridge / Timber Covered Bridges [0]
  • 2-15 Morgan's Raid [0]
  • 3-15 Canal Tunnels [0]
  • 4-15 First Paper Mill / Little Beaver Creek Bridge [0]
  • 5-15 Birthplace of Catholicism in Northern Ohio [0]
  • 7-15 Thomas J. Malone Bridge / Gaston's Mill [0]
  • 8-15 Log House Museum [0]
  • 9-15 Gateway to the Northwest [0]
  • 10-15 Death of Pretty Boy Floyd [0]
  • 11-15 Harvey S. Firestone [0]
  • 12-15 Riverview Cemetery [0]
  • 13-15 The Pottery Capital of America [0]
  • 14-15 Unserheim [0]
  • 15-15 Teegarden-Centennial Covered Bridge / Teegarden [0]
  • 16-15 Ohio's Gateway [0]
  • 17-15 Cherry Valley Coke Ovens [0]
  • 18-15 Land Ordinance of 1785 / The Seven Ranges [0]
  • 20-15 Log House Museum [0]
• Coshocton County [9]
• Crawford County [9]
• Cuyahoga County [147]
• Darke County [7]
• Defiance County [7]
• Delaware County [21]
• Erie County [34]
• Fairfield County [11]
• Fayette County [8]
• Franklin County [125]
• Fulton County [5]
• Gallia County [21]
• Geauga County [19]
• Greene County [29]
• Guernsey County [5]
• Hamilton County [95]
• Hancock County [21]
• Hardin County [16]
• Harrison County [3]
• Henry County [6]
• Highland County [8]
• Hocking County [6]
• Holmes County [4]
• Huron County [8]
• Jackson County [11]
• Jefferson County [13]
• Knox County [16]
• Lake County [26]
• Lawrence County [10]
• Licking County [30]
• Logan County [15]
• Lorain County [35]
• Lucas County [67]
• Madison County [3]
• Mahoning County [46]
• Marion County [17]
• Medina County [14]
• Meigs County [20]
• Mercer County [5]
• Miami County [33]
• Monroe County [6]
• Montgomery County [37]
• Morgan County [20]
• Morrow County [4]
• Muskingum County [17]
• Noble County [3]
• Ottawa County [21]
• Paulding County [5]
• Perry County [15]
• Pickaway County [11]
• Pike County [7]
• Portage County [19]
• Preble County [9]
• Putnam County [7]
• Richland County [9]
• Ross County [16]
• Sandusky County [9]
• Scioto County [11]
• Seneca County [15]
• Shelby County [6]
• Stark County [27]
• Summit County [48]
• Trumbull County [38]
• 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: 1743