M.N.
Washington D.C.
Answer: There are several resources you can explore that will have statistics and information regarding CSAs.
1. ATTRA publication: Community Supported Agriculture (Section on Trends and Statistics. Also see resource section).
2. SARE website: search for csa's under publications and databases. There is a database on csa statistics from Western SARE.
3. USDA National Agriculture Library: Alternative Farming Systems Information Center, CSA.
4. USDA Agriculture Marketing Service
5. USDA Agriculture Census: Look in 2002 census
6. CSA Website
7. Book: Sharing the Harvest
By Elizabeth Henderson (new edition is out)