Diane, there is no current information in MLS about 4908 Monroe St. in Bladensburg being listed for sale. According to the tax record the deed has not transferred since 1983. If you see a real estate sign on the property, it may mean that the seller's agent has not yet entered the property info (including price) into MLS or maybe it is a for sale by owner.
Sorry that there is no more information available
301-423-9200 x 178