Where?

Over the weekend I had to call 911 for an injured person, and I was impressed with how quickly the ambulance (Avondale) showed up. But I had to wonder about one question that the 911 operator asked me: What township was I in? I happened to know the answer, just because I'm pretty good about Chester County geography, and it was also close to my home. But I wonder what the percentage yield is on that question. I doubt that most people are aware of township boundaries, particularly in an emergency situation.