What category does car rental belong to?

Category 39.

Car rental as a service involves providing cars to users for use for a period of time and charging corresponding fees. This process involves the transfer of the right to use the car, not the transfer of ownership of the car.

Closer to a shipping service than the sale of goods. In trademark registration and classification, Class 39 mainly involves transportation and travel services, including taxi services, cargo transportation, travel booking, etc. Therefore, car rental services are classified in Class 39 to reflect that they provide services related to transportation and travel.