Question: What county in Maryland has a town that began as a streetcar suburb northeast of Washington D.C.?
Sentence (from "Mount Rainier Historic District"): The Mount Rainier Historic District is a national historic district located at Mount Rainier, Prince George's County, Maryland, which began as a streetcar suburb located northeast of Washington, D.C. The district was built on a gently rolling rural landscape from about 1900 to 1940.
Relevant evidence: Yes