BackgroundTransportation can help improve the health, quality of life, and community integration of people with intellectual and developmental disabilities (IDD). Yet, transportation is one of people with IDD's most common unmet needs. ObjectiveThe aim of this study was to examine if, and, how, states provide non-medical transportation to people with IDD in their Medicaid HCBS programs. MethodsUsing content analysis and descriptive statistics, this study analyzed fiscal year (FY) 2021 Medicaid HCBS 1915(c) waivers for people with IDD from across the nation to examine how they allocated transportation. ResultsIn FY 2021, all 44 states and the District of Columbia with HCBS waivers for people with IDD provided transportation services. Transportation was included either by providing a stand-alone service that exclusively provided transportation, or by being embedded within another service. Transportation was embedded within 896 different HCBS services for people with IDD, most commonly within residential habilitation services (26.70 %), supported employment services (19.44 %), and day habilitation (18.44 %). Thirty-three states (73.33 %) also provided 145 different stand-alone transportation services in their programs for people with IDD, to increase community integration and help people gain access to waiver services. A total of $781.78 million of spending was projected for stand-alone transportation services for 261,109 people with IDD (30.32 % of waiver recipients). ConclusionsHCBS waivers are an important resource for providing transportation for people with IDD. However, significant variation in how states do so may result in disparities or unmet needs.