Counties in Massachusetts

• Barnstable (185 historic properties)
• Berkshire (168 historic properties)
• Bristol (363 historic properties)
• Dukes (21 historic properties)
• Essex (464 historic properties)
• Franklin (48 historic properties)
• Hampden (148 historic properties)

• Hampshire (78 historic properties)
• Middlesex (1324 historic properties)
• Nantucket (4 historic properties)
• Norfolk (334 historic properties)
• Plymouth (118 historic properties)
• Suffolk (286 historic properties)
• Worcester (644 historic properties)