The economic growth of cities in developing countries is followed by the rapid growth of private vehicle ownership. The predicted exponential growth of vehicles will be followed by rapid growth in oil demand and a significant increase in environmental impact such as air pollution, traffic noise, and road traffic accidents. Therefore, it is important to understand the factors affecting car ownership. Studies on private vehicle ownership were mainly focused on the metropolitan area level. Using Badung regency as a case study, this study was focused on model car and motorcycle ownership in a medium-sized region by using Poisson regression. Data were collected from 180 households. The results indicated the characteristics of households with the highest percentage, namely car ownership per household of one unit (45.56%), and motorcycle ownership per household of three units (36.11%). For the motorcycle ownership model, there were three independent variables identified as significant predictors, i.e. monthly family income, monthly transport cost, and the number of family members. For the car ownership model, there were seven significant predictors, i.e. monthly family income ((MFI8, MFI7, MFI6), number of students in household, and other variables (safety, accommodating more family members, and social status).