Consistency is also my aim.
I have many paternal family members who lived in Philadelphia in the early 20th century. The city and county name are the same, so that can be a good exercise to key/type "Philadelphia, Philadelphia, Pennsylvania, USA" a few gazillion times :-)
If I am working from a street address, then I do use the double Philly. If I am unsure or have incomplete information, I only use Philly once - I am still "correct," just not as precise.
My maternal side has been in Georgia for a few hundred years. Georgia has 159 counties, and many of the same names are used for cities/towns, usually not in the same county. I know this this fact only too well because my 8th grade Civics teacher required us to memorize all 159 counties, with the names of the county seat, and we were drilled spelling bee style every Friday!
Long story to say I had a long internal debate about the use of the word "county" in my research, and finally came down on the side of "not."
Then there is my Irish branch, where County would normally come before the name of the county - another reason, for me, to not include it, since there would be a lack of consistency.