I have run in to this on my family tree when I know the place of residence for the family member and when I do not know the place of residence for the family member.
IF, I am not certain of the County/Shire/Municipality/City/whatever; THEN, I just use the likes of 'Google' "Maps" (or, similar) to investigate/research/check/confirm.
I find, that usually does the trick ...
I hope this helps.
to help clarify things a bit
can you give us a sample scenario that you have run into before
and what the speciifc challenge or confusion was.