Sites with Special Exposure Cohort (SEC) Status:
- Allied Chemical Corporation, 1959-1976 (Metropolis, Illinois) (a/k/a General Chemical Division)
- Amchitka Island Nuclear Explosion Site, 1974 and earlier (Amchitka Island, Alaska) (a/k/a Amchitka Island Test Center; Amchitka Island Test Site)
- Ames Laboratory, 1942-1970 (Ames, Iowa) (a/k/a Iowa State University)
- Area IV of the Santa Susana Field Laboratory, 1955-1964 (Santa Susana, Area IV, California) (a/k/a Atomics International; Energy Technology Engineering Center (ETEC); Liquid Metal Engineering Center (LMEC); Nuclear Development Field Laboratory (NDFL))
- Baker Brothers Site, 1943-1996 (Toledo, Ohio)
- Battelle Laboratories – King Avenue, 1943-56 (Columbus, Ohio)
- Bethlehem Steel Company, 1949-1952 (Lackawanna, New York)
- Blockson Chemical Company, 1951-1960 (Joliet, Illinois) (a/k/a Blockson Chemical Group; Olin; Olin Mathieson)
- Brookhaven National Laboratory, 1947-1993 (Upton, New York)
- BWX Technologies, Inc., 1959, 1968-1972, 1985-94 (Lynchburg, Virginia)
- Canoga Avenue Facility, 1955-1960 (Los Angeles County, California)
- Clarksville Modification Center, 1949-1967 (Fort Campbell, Clarksville, Tennessee)
- Clinton Engineer Works, 1943-1949 (Oak Ridge, Tennessee)
- Combustion Engineering, 1965-1972 (Windsor, Connecticut) (a/k/a Asea Brown Boveri)
- Connecticut Aircraft Nuclear Engine Laboratory (CANEL), 1958-1965 (Middletown, Connecticut) (a/k/a Connecticut Advanced Nuclear Engineering Lab; Pratt and Whitney Corp.; United Aircraft Corp.)