Yes, a class-action can be filed in state or federal court. However, the majority (80-85%) are filed in a federal court. Prior to Congress passing the Class Action Fairness Act (“CAFA”), class-action laws varied from state to state. The CAAFA was passed with the intent of standardizing class-action guidelines from state to state. As a result, the differences between a federal class-action and a state class-action are minimal. If you are trying to determine which type of class-action is best for your situation, then you should discuss the options with your attorney.