Cities/towns in St. Clair, Illinois

• Belleville (3 historic properties)
• Cahokia (4 historic properties)
• Collinsville (1 historic property)
• East St. Louis (3 historic properties)
• Lebanon (3 historic properties)

• Marissa (1 historic property)
• Mascoutah (2 historic properties)
• North Dupo (1 historic property)
• O'Fallon (1 historic property)
• St. Libory (1 historic property)