Cities/towns in Middlesex, Connecticut

• Centerbrook (1 historic property)
• Chester (5 historic properties)
• Clinton (2 historic properties)
• Cromwell (3 historic properties)
• Deep River (4 historic properties)
• Durham (2 historic properties)
• East Haddam (12 historic properties)
• East Hampton (3 historic properties)
• Essex (6 historic properties)
• Fenwick (1 historic property)
• Haddam (4 historic properties)
• Ivoryton (1 historic property)

• Killingworth (4 historic properties)
• Middle Haddam (1 historic property)
• Middlefield (2 historic properties)
• Middletown (31 historic properties)
• Millington (3 historic properties)
• Moodus (1 historic property)
• Old Saybrook (16 historic properties)
• Portland (4 historic properties)
• Saybrook (1 historic property)
• Westbrook (1 historic property)
• Westbrook and Deep River (1 historic property)