This study aimed to determine associations of healthcare access problems with services use among US children with autism spectrum disorder. We analyzed 2011-2014 National Health Interview Survey data on 651 children with autism spectrum disorder aged 2-17 years. There were three measures of healthcare access problems: (1) delays accessing healthcare, (2) difficulty affording healthcare, and (3) trouble finding a primary care provider. There were five service use measures: (1) [greater than or equal to]4 office visits, (2) [greater than or equal to]1 well-child visit, (3) flu vaccine, (4) prescription medication, and (5) [greater than or equal to]1 emergency department visit. Multivariable regression models estimated associations of [greater than or equal to]1 healthcare access problem with each service use variable and effect modification by socioeconomic status and race and ethnicity. Twenty-nine percent of children with autism spectrum disorder had [greater than or equal to]1 healthcare access problem. Having [greater than or equal to]1 healthcare access problem was associated with lower adjusted odds of [greater than or equal to]1 well-child visit or prescription medication use but higher adjusted odds of [greater than or equal to]4 office visits or [greater than or equal to]1 emergency department visit. No significant association was found for flu vaccine. Associations of healthcare access problems with emergency department use were most pronounced for higher socioeconomic status and White, non-Hispanic subgroups. Intervention, such as insurance expansion, is needed to improve healthcare access for children with autism spectrum disorder.