Autistic adolescents and young adults face barriers to accessing health care, particularly during the pediatric-to-adult care transition. This study compared health care access, utilization, and provider interactions between rural and urban autistic adolescents and young adults. Autistic adolescents and young adults (N = 180) aged 14-25 were recruited through autism registries and community agencies across multiple US states from October 2022 to June 2023. They completed the Health Care Transition Experience Survey, a 51-item questionnaire evaluating health care experiences. Rural-urban differences were analyzed through descriptive and inferential statistics. Rural autistic adolescents and young adults (n = 84) relied more on a single health care location, while urban autistic adolescents and young adults (n = 96) more often used multiple providers (72.6% vs 56.3%, p = 0.046). Rural autistic adolescents and young adults reported greater challenges with providers lacking autism-specific knowledge (40.5% vs 24.0%, p = 0.017) and limited nearby providers (57.1% vs 26.0%, p < 0.001). They also encountered more issues with dental insurance acceptance (46.4% vs 12.5%, p = 0.015), while urban autistic adolescents and young adults more often lacked dental insurance (33.3% vs 3.6%, p = 0.008). Significant rural-urban disparities were found in health care experiences, particularly provider availability and autism expertise in rural areas. Targeted interventions addressing rural health care barriers and enhanced provider training in autism care are needed.