Washington State Twin Registry

The Washington State Twin Registry is a community-based registry of twins interested in participating in valuable research studies.

While we welcome twins from around the world to join our registry, we primarily recruit twins by sending invitations to those who identify as a twin with the Washington State Department of Licensing (DOL).

With a vast number of research partnerships both locally and internationally, we conduct numerous studies of health and well-being. With its rapidly growing database, the Washington State Twin Registry is well on its way to becoming one of the best twin registries in the United States.