What's max amount of cars allowed on state farm insurance policy?

To get an exact answer you would want to contact State Farm directly. Most companies will allow four cars on a policy. Some companies have rules about how many cars you can list per number of drivers. For instance, if you have one driver, some companies will only allow you to list two cars on one policy. Again, check with State Farm directly for their exact policy rules. Good luck and if you have any questions, don't hesitate to ask.