Ridgefield Historical Society is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Historical Organizations

North American Industry Classification System (NAICS) Categories:

• Civic And Social Organizations > Organizations, Historical
• Other Similar Organizations (Except Business, Professional, Labor, And Political Organizations) > Organizations, Historical

Standard Industry Classification (SIC) Categories:

• Membership Organizations, Nec > Organizations, Historical