This has been a very interesting and enlightening discussion. I have just finished 'cleaning' my Places - I wish I had read this topic BEFORE starting the cleanup.
I have a lot of St. Louis City, Missouri locations. What is aggrevating is that after having geocoded, Splitting Details and 'Using Standard Names' and finally 'Merging' the duplicates. The CountyCheck pops up when 'Saving' facts and offers the non-standard variants of the Saint Louis. St. Louis City became its own county in 1886 and is sometimes it is referred to as 'Saint Louis,Saint Louis (Independent City),Missouri' The standardize name is 'Saint Louis,Saint Louis (City),Missouri' and the the CountyChecker offers 'Saint Louis,St. Louis,Missouri' or 'Saint Louis,St. Louis City,Missouri' I wish they'd both use the same standard!