My post on Michigan's oldest companies received so much interest I decided to take a look at other states that benefit from having a number of Century Club Companies. Ohio has at least 72 companies that have prospered for 100 years and more. Of these, 13 are public and at least 44 are generational family firms. (One, Smuckers, is both publicly-traded and run by 5th generation family.) If you know of a company that has been in continuous, independent operation for over 100 years and should be added to this list, or have a correction to any of the information provided here, please let me know.
1803: Golden Lamb (restaurant & hotel), Lebanon Run by the family that purchased it in 1926 - generation?
1812: Rider's Inn, Painesville
1833: Austin Powder (industrial explosives), Cleveland
1836: Stevenson Manufacturing (agricultural service), Wellsville
1839: Procter & Gamble, Cincinnati public
1840: Candle-Lite, Leesburg private (manufacture candles)
1840: End of the Commons General Store, Mesopotamia
1842: Verdin Company (bells), Cincinnati 6th generation
1846: Powell Valves, Cincinnati 3rd generation?
1847: Cleveland-Cliffs (mining), Cleveland public
1855: Schoedinger Funeral Services, Columbus 6th generation
1860: Requarth (lumber, kitchens), Dayton 5th generation
Wilson Bohannan Lock, Marion 7th generation
1866: Baker & Baker Jewelers, Marietta
Huntington Bancshares, Columbus public
Sherwin-Williams, Cleveland public
1868: Gordon Lumber, Fremont
1870: Graeter's (ice cream), Cincinnati 5th generation
1871: Ritter's Office Outfitters, Mansfield employee-owned
1872: Ohio Valley Banc Corp, Gallipolis public
1873: Schantz Organ, Orrville 4th generation
1877: Greif (packaging & containers) Delaware public
1880: Freeport Press, New Philadelphia
1881: Seeger Metal & Plastics, Toledo 5th generation
1882: Ohlman Greenhouse, Toledo 5th generation
1885: Belden Brick, Canton 5th generation
Gibson's Bakery, Oberlin 4th generation
1886: Mennel Milling, Fostoria 5th generation
1887: W.H. Fay (steel haulers), Cleveland 2nd generation
1888: Coyle Funeral & Cremation Services, Toledo 5th generation
1891: Acme Fresh Market, Akron 5th generation
1892: Rieck (HVAC contractor), Dayton 4th generation
1895: Lincoln Electric, Cleveland public
1896: Hill & Griffith (die casting), Cincinnati
1897: Smucker's, Orrville public & 5th generation
1898: Goodyear Tire & Rubber, Akron public
Robertson's Building Center, Malvern 3rd generation?
1899: Timken Company, North Canton public
Wayne Savings Bancshares, Wooster public
1900: Block Communications, Toledo 3rd generation
French Oil Mill Machinery, Piqua 4th generation
McNerney Companies (office furniture, construction, real estate), Northwood 4th generation
1901: Fifth Avenue Floral, Columbus
Kuhlman Corp (construction products), Maumee 5th generation
1902: Hyde Park Lumber & Design Center, Cincinnati 4th generation
1905: E.F. Boyd & Son (funeral services), Cleveland 4th generation
Fremont Company (sauces & pickles), Fremont 4th generation
1906: American Electric Power, Columbus public
American Greetings, Cleveland
1907: Bolin-Dierkes Funeral Home & Crematory, Zanesville 3rd generation?
1908: Cellar Lumber, Westerville 4th generation
Graves Lumber, Copley 4th generation
1909: Ansonia Lumber, Ansonia 4th generation
Geiger Brothers (contractors, engineers), Jackson
1910: Elford (construction), Columbus
Henry Bierce Supply (building materials), Tallmadge 3rd generation
Toledo Ticket (printing), Toledo 4th generation
1911: Woolpert (architecture, engineering), Dayton
1914: Bard Manufacturing (HVAC equipment), Bryan 4th generation
1915: Kottler Metal Products, Willoughby 4th generation
Midmark (medical products), Dayton 4th generation
Ruhlin (construction), Sharon Center 3rd generation, ESOP
1916: Ondrus Hardware, Toledo 3rd generation
Walt Sweeney Ford, Cincinnati 3rd generation (and more?)
Wangler Hardware, Fort Recovery 5th generation
1917: LEWCO (industrial equipment), Sandusky 2nd generation
Parker Hannifin (industrial controls), Cleveland public
RMS Freight Systems, Roseville 2nd generation
Rulli Brothers (retail grocers), Youngstown 3rd generation
1919: Mill-Rose (industrial brushes), Mentor 4th generation
Schauer Group (insurance agents), Canton 4th generation
1920: Copp Systems (security services), Dayton
If you'd like to learn more about how companies such as these have managed to survive for 100 years and more, you can find my book Lessons from Century Club Companies: Managing for Long-Term Success at Amazon and Barnes & Noble
https://www.amazon.com/Lessons-Century-Club-Companies-Long-Term/dp/0984898603
https://www.barnesandnoble.com/w/lessons-from-century-club-companies-vicki-tenhaken/1123609572