Prince George's County Farmers Markets
There is a link on our website (Under Vegetables/GrowIt Eat It > Resources>Buy Local) which will get you to to "Maryland's Best", which is part of the Maryland Department of Agriculture, and they keep the lists of local Farmer's Markets. They've not yet released the 2016 list, but you can search their website by county. Here are your county results:
Probably the fastest way is to google "Maryland Farmers Markets.