I would obviously add a disclaimer that the location provided may not represent the caller’s current location as it is where the number is registered.

I’m aware about the area code part. Is there a list of these office codes so that I can refine these numbers’ registered areas like my phone does?

The number linked is a government number.

I understood that, just how does my iPhone specifically find “Ottawa” specifically when 613 only identifies Eastern Ontario?

What I don’t understand is the fact that 613 is Eastern Ontario? How did my iPhone pick up “Ottawa”?