| American Seed Trade Association | association | 1883 | Tomato, Corn, Wheat, Watermelon |
| Association of Official Seed Analysts | association | - | |
| Association of Official Seed Certifying Agencies | association, agency | 1919 | Corn, Wheat |
| Cornell Long Island Horticultural Research and Extension Center | research-institution | - | Tomato |
| Cornell Plant Breeding and Genetics | breeder, agency | - | Pepper, Tomato |
| International Seed Federation | association | 2002 | |
| International Seed Testing Association | association | 1924 | |
| Kentucky State University College of Agriculture, Food Science, and Sustainable Systems | research-institution | 1886 | Tomato |
| LSU AgCenter | research-institution, breeder | 1886 | Pepper |
| National Association of Plant Breeders | association | - | |
| National Council of Commercial Plant Breeders | association | 1955 | Corn, Wheat |
| NC State Tomato Breeding Program | breeder, agency | - | Tomato |
| NMSU Chile Pepper Institute | breeder, agency | 1992 | Pepper |
| OSU Seed Laboratory | testing-lab, agency | - | Perennial Ryegrass, Wheat |
| Rutgers NJAES | breeder, agency | - | Tomato |
| Seed Savers Exchange | association, retailer | 1975 | Tomato |
| Texas A&M AgriLife Research | research-institution, breeder | 1876 | Pepper |
| University of Kentucky College of Agriculture, Food and Environment | research-institution, agency | 1865 | Tomato |
| USDA Agricultural Marketing Service | agency | - | |
| USDA Agricultural Research Service | agency, breeder | - | Tomato, Corn, Wheat |
| Wyoming Seed Analysis Laboratory | testing-lab, agency | - | Wheat |