Comment by bombcar

Yeah, every "city" has a point at which you're clearly "outside the city" but what you count changes depending on who you talk to.

https://www.google.com/maps/place/Okutama,+Nishitama+Distric...

The "gray areas" on a map like this might be a decent "rule of thumb" but even those can be misleading. The best way to determine it is talk to a local.

The other amusing thing is that if some city is famous tons of areas around it will often claim it in name if not address; you'll find "New York Shop" in New Jersey from time to time, especially if doing mail-order business.