Mattress Firm Southside Plaza is located in Salem NH, Zip Code: 3079 on the street of 303 S Broadway. If you want to ask something about the furniture, mattresses, catalog, pricing, hours and directions, the Phone number is 603-893-7300. The coordinates that you can use in navigation applications to find Mattress Firm Southside Plaza quickly are 42.75719 -71.21109 USA