The number of women and girls (WG) with bleeding disorders cared for at hemophilia treatment centers has increased dramatically over the last 30 years, owing to improved recognition of bleeding symptoms specific to WG. However, basic epidemiologic data of this population remain elusive. The ATHNdataset (American Thrombosis and Hemostasis Network) is a surveillance tool for people with bleeding disorders in the United States, providing demographic as well as bleeding symptom and treatment information. The aim of this study was to characterize the female cohort within the ATHNdataset.