International Thriller Writers (ITW) In Brief Year Formed: 2004 Tax Code Designation: 501(c)(6) (See NCCS) Incorporation State: Delaware Employer Identification Number: 13-4287988 Home Page: http://thrillerwriters.org/ ByLaws: http://thrillerwriters.org/about-itw/bylaws/ Additional Resources National Center for Charitable Statistics ProPublica Nonprofit Explorer GuideStar