To know who owns a particular car, go to your local Department of Motor Vehicles. If you know the VIN number of the car, you can fill out a form to officially request information about the car's current owner. You can go to the local police department with the car's license plate number. If that does not work, you can always hire an online private investigator, licensed private investigators are allowed to search public records to find the owner of a car. Finally you can join a public record database that allows you to look up the owner of the car via its license plate number.