Question: What is the population of the community where Giant-Landover has its headquarters?
Sentence (from "Giant-Landover"): Giant Food of Maryland, LLC, also known as Giant, is an American supermarket chain with 169 stores and 159 full service pharmacies located in Delaware, Maryland, Virginia, and Washington, D.C. It is headquartered in an unincorporated area of Prince George's County, Maryland, in Landover.
Relevant evidence: Yes