Mattress Firm Knox-Henderson is located in Dallas TX, Zip Code: 75205 on the street of 3015 Knox St. If you want to ask something about the furniture, mattresses, catalog, pricing, hours and directions, the Phone number is 214-559-6101. The coordinates that you can use in navigation applications to find Mattress Firm Knox-Henderson quickly are 32.82231 -96.78705 USA