About two years ago, someone on FR posted a link to Guidestar (
http://www.guidestar.org) which compiles information on non-profit organizations. The advanced search feature plus "Islamic" in the keyword entry and your state selected will provide a list of Islamic organizations in your state which have filed as tax-exempt. At that time, there were 12 Islamic organizations in Missouri; three months ago there were 15; today there are 18. The locations of some of these organizations may surprise you.
