Cities/towns in Mercer, New Jersey

• East Trenton Heights (1 historic property)
• Eldridge Park (1 historic property)
• Ewing (2 historic properties)
• Ewing Township (1 historic property)
• Hamilton Township (1 historic property)
• Harbourton (1 historic property)
• Hightstown (2 historic properties)
• Hopewell (5 historic properties)
• Lambertville (1 historic property)
• Lawrence (2 historic properties)
• Lawrenceville (4 historic properties)

• Pennington (7 historic properties)
• Penns Neck (1 historic property)
• Princeton (19 historic properties)
• Princeton Borough (2 historic properties)
• Rocky Hill (1 historic property)
• Rosedale (1 historic property)
• Titusville (3 historic properties)
• Trenton (42 historic properties)
• West Trenton (1 historic property)
• West Windsor (1 historic property)
• Windsor (1 historic property)