Raccoon in compost
It is possible that this was a one-time visit for food, but raccoons begin nesting in April, so there is the possibility that your visitor has found a nice place for nesting. We recommend that you contact a wildlife control professional or your local animal control office to have the raccoon removed safely. Raccoons can carry rabies and a permit is required to trap them in Maryland.
There is information here about trapping and removal:
And here is information to on how to find a wildlife control professional:
When the raccoon is removed, try to make sure your compost bin remains securely covered. Exclusion is the best thing you can do to try to keep them away.
The Maryland Nuisance Wildlife Hotline at 877-463-6497 (operated by the Maryland Department of Natural Resources) is also a good resource if you have additional questions about dealing with raccoons or other nuisance wildlife.