Maia, You're always correct! Merriam-Webster's Unabridged Dictionary (in the 'style guide' section) uses "the Enid, Oklahoma plant," without a comma after "Oklahoma." Bryan Garner does not support the comma after a specified year in a full date serving as an adjective: 'The July 16, 2005 meeting was a success.' ... Not 'The July 16, 2005, meeting was a success.' And the same for 'Enid, Oklahoma is my hometown' and 'July 5, 2000 is the date for the renovations. (Again, no comma after 'Oklahoma' or '2000.') Stuttgart, Germany is the location of this momentous event. (No comma after 'Germany' is indeed correct!) Today's style guides favor the commas in these spots. I agree with you that they're wrong. Accolades and kudos to you!