Cities/towns in Ottawa, Ohio

• Danbury (1 historic property)
• Elmore (1 historic property)
• Genoa (3 historic properties)
• Gibraltar Island (1 historic property)
• Lakeside (1 historic property)
• Lakeside--Marblehead (1 historic property)
• Marblehead (3 historic properties)

• Middle Bass Island (4 historic properties)
• Mineyahta-on-the-Bay (1 historic property)
• Oak Harbor (1 historic property)
• Port Clinton (7 historic properties)
• Put-in-Bay (4 historic properties)
• South Bass Island (1 historic property)