contact ASTC (Association of Science and Technology Centers) in Washington,
DC, 1025 Vermont Ave NW, Suite 500, Washington, D.C. 20005 They have over 450
member science centers around the world. They do have an excellent directory
as well as other publications, an annual conference and even a workshop on
starting a science museum. Phone number is 202-783-7200.  their e-mail
address is [log in to unmask]

Also, the Association of YOuth Museums is not totally science focused but
many of their member children's museums do some science or even all science.
Their address is AYM, 1775 K St. NW Suite 595 Washington, DC 2006. Phone
202-466-4144. Their e-mail is [log in to unmask]