Cities/towns in Contra Costa, California

• Antioch (4 historic properties)
• Berkeley (1 historic property)
• Byron (1 historic property)
• Clayton (1 historic property)
• Concord (2 historic properties)
• Danville (2 historic properties)
• Hercules (1 historic property)
• Martinez (6 historic properties)
• Orinda (3 historic properties)

• Pacheco (1 historic property)
• Pinola (1 historic property)
• Pinole (1 historic property)
• Pleasant Hill (1 historic property)
• Port Costa (1 historic property)
• Richmond (10 historic properties)
• San Ramon (1 historic property)
• Walnut Creek (2 historic properties)