A parking system may include a number of parking locations, where the availability of each parking location may be tracked based on detection of whether a vehicle is in the parking location. Accordingly, a parking system may organize parking locations based on availability and unavailability. In some cases, mobile device sensors may be used to determine whether a mobile device has left the vehicle in the parking location (e.g., and thus the parking location is still unavailable) or whether the mobile device has left the parking location in the vehicle (e.g., and thus the parking location is now available). In some cases, the parking system may organize available and unavailable parking locations, facilitate user listing of parking locations, track of available and unavailable parking locations, and track different characteristics of different parking locations (e.g., such as location, size, cost, availability, etc.), among other examples.