Evidence-based maternal, infant, and early home visiting (EBHV) is a potential strategy to support parent and child health and well-being among families headed by a parent with an intellectual disability (ID). Little is known about the capacity of EBHV programs to meet the needs of parents with ID effectively. This study examined home visitor practices and perceptions of services for parents with ID. Home visiting staff recruited from a national practice-based research network participated in web-based surveys. Practices and perceptions varied widely across sites and were associated with home visitor knowledge and self-efficacy and site implementation supports, such as policies, curricula, and community collaboration. More work is needed to understand and strengthen EBHV services for parents with ID.