Post Offices in Rensselaer, Indiana, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Collegeville Post Office No Reviews Favorite Phone: (219) 866-5322Retail Hours Rensselaer Post Office No Reviews Favorite Fax: (219) 866-0784Phone: (219) 866-5322Retail Hours