The availability of adequate parking spaces in hospital environment has been always an important factor to achieve a better traffic system. We study the visitors’ demand for hospital parking. In the selected study areas of Serdang Hospital, Sungai Buloh Hospital, Kulim Hospital and Seberang Jaya Hospital, there are always complaining about lacking of parking supplied which leads to illegal roadside parking that interrupting traffic flow of the surrounding area. Lack of parking is mainly contributed by the increasing number of patients visiting the hospital. The main objective of this study is to develop a parking demand model based on the number of hospital beds as a guide for relevant authorities. Linear regression method was used to develop the model. Our findings show that, although extra parking has been provided in some hospitals, the problem with illegal parking still happens.