[Dx4win] Where (what field) do you specify the city name for U.S. QSOs?

[Lee Hallin]

Do you put the city name in the QTH field (Ex. Los Angeles) .. while also populating the STATE field with the state abbreviation?
 
Do you put the city name in the QTH field along with the state (Ex. Los Angeles,CA)? 
 
If you aren't using DX4WIN v8.??, what field, and what form/convention, do you put the city name in?
 
I'm taking a stab at County Hunting and don't want to have to go through my log and look up each county, by "hand", using the city name and state in the QSO. 
 
I'm thinking of writing a program that would look at an ADIF file and update the CNTY field.  For this reason, I was wanting to know of any conventions that might already be in use.
 
Does anyone else have interest in using such a program, if I write it?
 
Thanks,
Lee  N7NU