Prospect Borough is a small community of approximately 1200 residents located in Butler County just a few minutes from beautiful Moraine State Park. It is home to the "Big Butler Fair " which is located along State Route 422 in Prospect. You can see events happening at the fairgrounds by clicking here. We are located only 7 miles from I-79 and are within easy reach to such areas as Pittsburgh, Erie, and the PA Turnpike. The borough is located in the Slippery Rock School District, with Moraine Elementary School on our Main Street. Our local organizations include the Boy Scouts, Woman's Club, Prospect/Portersville Rotary, and our own local Chapter of the American Legion. We are pleased to have celebrated our 175th year. We have an annual Community Day complete with parade during Memorial Day weekend.