If you find a baby squirrel or opossum, contact me at (703) 772-2766. Please note that I'm in Fredericksburg, VA. Please leave me a message and I'll get back to you as soon as I can. I'm probably feeding something. Or cleaning poop.
IF you are in Northern, VA, please contact the Wildlife Rescue League helpline at (703) 440-0800. They are staffed solely by volunteers, so please leave a message and someone will call you back as soon as possible.
Department of Wildlife Resources (DWR) has a list of all licensed rehabbers in Virginia. The list is by county.
The Humane Society of the United States has a site where you can find a licensed rehabber by state.