Interstate road transportation remains an important component of mobility and economic interaction in Nigeria, particularly in cities where privately owned transport parks dominate passenger movement. Despite the growing role of private transport operators, concerns relating to commuter satisfaction and service quality continue to attract attention among transport researchers and policy makers. This study examined interstate mobility and commuter satisfaction with services provided by private transport parks in Ilorin, Kwara State, Nigeria. The study adopted a descriptive survey research design. The population comprised interstate commuters using selected private parks, while a sample of 76 commuters was selected through simple random sampling technique. Data were collected using a researcher-developed questionnaire titled Interstate Mobility and Commuter Satisfaction Questionnaire (IMCSQ) with a reliability coefficient of 0.84 obtained using Cronbach’s alpha. Descriptive statistics including mean and standard deviation were used to answer the research questions, while t-test and Analysis of Variance (ANOVA) were used to test the hypotheses at 0.05 level of significance. Findings revealed that commuters were generally satisfied with the services provided by private transport parks, particularly in the areas of safety, comfort, and driver behaviour. However, ticketing procedures recorded relatively low satisfaction ratings. The study further showed that gender and age did not significantly influence commuter satisfaction, whereas educational qualification and travel frequency significantly influenced commuters’ perception of service quality. The study concluded that improving operational coordination, especially ticketing and service reliability, would enhance commuter experiences and strengthen interstate mobility within the Nigerian transport system.