Pennsylvania Certified Organic
This accredited organic certifier publishes an annual list of the companies its aware of which sell organic seeds.
Saving Our Seed Project
The Save Our Seed Project of the Carolina Farm Stewardship Association offers a comprehensive search of organic sources.
Washington State University
The Center for Sustaining Agriculture & Natural Resources at Washington State University produced a list of organic seeds by variety in January 2006.
Organic Seeds Partnership
The Organic Seed Partnership will enhance and expand a set of existing complementary, regionally-focused activities to create a strong national network aimed at developing and delivering improved vegetable varieties selected for superior performance in organic systems.
Organic Seed Alliance
The Organic Seed Alliance has created a Seed Producers Database. The Seed Producers Database is designed to facilitate connections between seed growers and larger-scale seed purchasers. Both seed growers & seed purchasers can reach a wider audience more easily through the OSA Seed Producers Database.
ATTRA - National Sustainable Agriculture Information Service
Among many other publications and resources, ATTRA runs an Suppliers of Seed for Certified Organic Production Database. This database provides sources for organic seed of both agronomic and horticultural crops. Some national, mail-order suppliers of untreated seed are included, with the emphasis on small alternative seed companies offering open-pollinated vegetable, flower, and herb seed.