Party supply retailer iParty said it plans to open two new stores, one in Waltham, the other in Plaistow, N.H.

In a statement, iParty chairman and chief executive Sal Perisano said: “We plan to open both the Plaistow and Waltham stores in time for the 2012 Halloween season. When these two stores open, we will have 54 iParty stores in New England and Florida. These stores along with our temporary Halloween stores and our website iParty.com continue to build our strong party and Halloween brand nationwide.”

The company is headquartered in Dedham.