1. Define Castle Shannon as a service area, not a demand forecast
Castle Shannon is a borough in Allegheny County, Pennsylvania. That exact relationship matters when you decide how your profile and service zones should describe the area. A municipality, its county, a metropolitan area and the households or individuals within them are not interchangeable targeting concepts. The available Census record identifies the borough and its population estimate; it does not show how many people search for a lawyer, which practice areas they need or how many firms compete for inquiries.
Recommended approach
Start with the locations your firm is actually prepared to serve. Review whether Castle Shannon belongs in a focused service-area plan, a broader Allegheny County plan or a more selective practice-area configuration. Keep geographic eligibility separate from performance expectations, then use consultation and campaign reporting to decide whether the coverage is useful.
