State laws differ, but yes, in many states you do not need a driver's license but can register and title a vehicle with just a state identification card.
Normally one is not required to have a valid license but will need at least a State ID to purchase and then register a vehicle. There are those that are unlicensed due to a handicap, etc that want to buy a car in their own name but will have someone that is fully licensed drive them around and so states allow a person just to show identification.
For example in California a driver's license is not required to be shown to buy, title or register a car. However if you do not have a driver's license it is very difficult to get insurance which can be an issue in most all states. California car insurance law requires that you need insurance to register a car.
The Pennsylvania Department of Transportation (PennDOT) states that individuals are required to have a valid form of Pennsylvania identification in order to make application to title and register a vehicle in PA.
PennDOT notes that the Department of Driver Services will only allow agents to issue title and registration documents to customers who provide one of the following credentials for identification purposes:
- a valid Pennsylvania Photo Driver's License
- a valid Pennsylvania Photo Identification Card
- a valid Pennsylvania Photo Exempt Driver's License
- a valid Pennsylvania Photo Exempt Identification Card
- a valid U.S. Armed Forces Common Access Card - Dependents of Armed Forces Personnel must provide a valid United States Uniformed Services Identification and Privilege Card (DD Form 1173)
So while many states will allow you to buy and register a vehicle without a valid driver's license unless you have a way in which to obtain auto insurance for the vehicle than it will be difficult to actually title and register the car without proof of insurance. It will be difficult to get insurance without a license since it is a main rating factor and thus you will need a primary driver listed on the policy that is licensed and be able to exclude yourself.
To find out what documents your state requires for registering a vehicle contact your state's Department of Motor Vehicles.