First Presbyterian Church is located at 100 S. Pierce Ave in Mason City, Iowa.  It is two blocks north of highway 122, the main east-west highway through Mason City. The Walgreen store on the southeast corner of Pierce and the highway is a landmark where you will turn North. There are two churches on S. Pierce both on the West side. The Greek Orthodox Church is the first church and is next to First Presbyterian Church. Go to Google for a map.