Below are some state, national and international organizations devoted to protecting our architectural resources.
Arizona
Arizona Preservation Foundation
Arkansas
Preserve Arkansas
California
Palm Springs Modern Committee
Los Angeles Conservancy
Modernism Week
MIDCENTURY PRESERVATION SOCIETY
Florida
Florida Trust For Historic Preservation
Gainesville
University of Florida Preservation
Architecture Sarasota
AIA Gainesville
Illinois
Chicago Bauhaus and Beyond
Frank Lloyd Wright Trust
Indiana
Indiana Landmarks
Kansas
Lawrence Modern
North Carolina
Preservation Greensboro
North Carolina Modernist
Massachusetts
Historic New England
Michigan
Mid-Century Modern Midland
Mississippi
Preservation in Mississippi
Missouri
ModernSTL
New York
hamptons20centurymodern
Nevada
Nevada Preservation Foundation
Oklahoma
Okie Mod Squad
Ohio
Ohio Modern
Oregon
Pennsylvania
Preservation Alliance
Texas
Houston Mod
Washington
Historic Seattle
Mid Century Spokane
National
American Institute of Architects
National Trust for Historic Preservation
The John Lautner Foundation
International
DO.co,mo.mo US
Frank Lloyd Wright Building Conservancy
Getty Conservation Institute
The Paul Rudolph Institute for Modern Architecture
Richard and Dion Neutra
World Heritage Convention
International