Post Offices in Fitchburg, Massachusetts, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Fitchburg Post Office No Reviews Favorite Fax: (978) 342-3614Phone: (978) 342-6343Retail Hours Prichard Plaza Post Office No Reviews Favorite Phone: (978) 345-0864Retail Hours