Individuals with intellectual and developmental disabilities (IDD) face several barriers to healthcare, making them less likely to receive numerous routine preventive health screenings. Preventive healthcare is a critical aspect to maintaining health and wellness, particularly for people with complex health needs. This study examines individual- and state-level factors associated with mammogram and colonoscopy screenings in mid- and later-life for adults with IDD receiving state services. Multilevel logistic regression models analyzed data from the 2012-2013 and 2018-2019 waves of the National Core Indicators In-Person Survey (NCI-IPS). Results indicated that factors such as age, living situation, transportation access, and community involvement were associated with completion of both preventive screenings. Medicaid expansion was associated with a significantly greater likelihood of completing a colonoscopy screening only among younger persons in the sample (i.e., in their 50s). These findings may have implications for completion of preventive health screenings for adults with IDD.