Minimum acceptable drawing scale for the plat of the actual subdivision: 1" = 100". Us to start the process.If the proposed project is located in two or more municipalities, show municipal boundary lines on the plan. (8). This dataset demarcates the municipal boundaries in Allegheny County. Data was created to portray the boundaries of the 130 Municipalities in Allegheny County. Our GIS viewer allows users without geographical information systems (GIS) software to view, print, and share spatial data. You can use your property's dimensions as noted on the Allegheny. County Real Estate website to determine where the remaining lines are. The purpose of the Allegheny Lease Mapping Project was to obtain and map all parcels found in the county to have some kind of oil and gas related transaction. Allegheny County Council Map.