Mattress Warehouse of Washington DC Mattress Warehouse of Washington DC Columbia Heights Retail 3339 14th Street Northwest, Washington, DC 20010 (202) 588-1080 https://stores.sleephappens.com/United-States/DC/Washington/Mattress-Warehouse-of-Washington-DC-14th-Street/238/11139?utm_campaign=yext&utm_medium=organic&utm_source=GMB