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Ohio Department of Transportation）则以从1-88的序列数及三个字母的缩写作为各县的代码。 Laning, J.F. The Evolution of Ohio Counties. Ohio Archaeological and
俄亥俄州机场列表
2008（页面存档备份，存于互联网档案馆）, updated 18 December 2009 Ohio Department of Transportation (ODOT): Office of Aviation: Airports（页面存档备份，存于互联网档案馆） Other sites used
of "Common Use" Rail Corridors (PDF). Office of Research and Development, Federal Railroad Administration, United States Department of Transportation
US-24 Indiana Highway Ends: US-24 Info on Ohio re-alignment of US-24 from ODOT（页面存档备份，存于互联网档案馆） Live webcam view of US Hwy 24 from Woodland Park, Colorado（页面存档备份，存于互联网档案馆）
Illinois Highway Ends: US 20 Indiana Highway Ends: US 20 In Search of...U.S. Route 20 in Ohio by Michael G. Buettner, February 2006 US 20 Travelogue in New