http://www.louisvillecsa.com/csa/default.aspx has a few organic producers. Most have not bothered to pursue certification because of the expense for smaller producers is considerable from what I have read.
We've just started our second season with the Family Farm Project,
http://www.louisvillecsa.com/csa/view.aspx?csaid=8. They are not listed as an organic producer, but we have been very satisfied with their produce. It's a great way to support our farmers, buy fresh and local, and they are good people too.
HTH-Doug