What is the phone number for mary washington hospital? Mary Washington Hospital Contact Phone Number is : +1 540-741-1100. and Address is 1001 Sam Perry Blvd Fredericksburg, VA 22401, United States. Mary Washington Hospital is a famous healthcare center based in Fredericksburg, Virginia.Where is mary washington hospital? The address of Mary Washington Hospital is 1001 Sam Perry Blvd Fredericksburg, VA 22401, United States.Where is mary washington hospital in virginia? Mary Washington Hospital is a 451-bed, full-service hospital in Fredericksburg, Virginia. It is one of seven level II trauma centers in Virginia and was ranked 6th best in the state by U.S. News and World Report.