Under the healthcare reform act, states were expected to set up exchanges to help people who don't get health insurance through their employers.
But for now, Pennsylvania is opting out.
Governor Tom Corbett said federal authorities could not give him clear information on how much it would cost, so the state will not set up its own system.
That means people in Pennsylvania will have to go through the federal exchanges.
The exchanges act as one-stop shopping where households and small businesses can buy plans from private insurers at a better price than if they were to do it alone.
Pennsylvania, New Jersey and Delaware all opted out of state-based programs.
Critics say this could make insurance more expensive.