A number plate is a unique identifier of a vehicle; two vehicles are not allowed to have the same number plate. A number plate can be used to look up information on the owner of a vehicle. Police officers, debt collectors and bounty hunters frequently use number plates to find out information on a suspect. An individual involved in a hit and run accident can look up the number plate of the vehicle that hit them.
Contact your local DMV with the number plate number for which you need information. Depending on state laws, they may be able to help you. There is a chance you will have to pay for the information.
GovDMVRecords allows you to register for a one year subscription at a cost of £12.90 (as of Nov., 2010). From there, you can search as many number plates as you want.
Number Plate Search is a Website that allows you to gather information on any registered vehicle in the U.S. It provides information, such as the make and model of the vehicle, the owner's name and the owner's address.