Cities/towns in Douglas, Colorado

• Castle Rock (5 historic properties)
• Denver (1 historic property)
• Franktown (3 historic properties)
• Larkspur (3 historic properties)
• Littleton (1 historic property)

• Louviers (2 historic properties)
• Palmer Lake (2 historic properties)
• Parker (1 historic property)
• Sedalia (7 historic properties)
• Waterton (1 historic property)