Membership in Mystery Writers of America numbers more than 3,000 Active, Associate, and Affiliate members internationally.
There are four categories of membership:
- Active members are published professional writers of fiction or nonfiction in the crime/mystery/suspense field.
- Associate members are professionals in allied fields such as editors, publishers, agents, booksellers, librarians, etc.
- Affiliate members are writers of crime/mystery/suspense fiction who are not yet professionally published, and others with an interest in the genre, including unpaid reviewers and fans or publishers not approved by MWA.
- Corresponding members are those who are qualified members living outside the United States.