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Unfortunately, I don't have an easier answer than was given here. I think you'll want a chained app. First step being to get the unique values and a second step to run the app with those populating the lisbox.
Hi @CharlieS. I figured it out. I took your workflow and added a Multi_Field Formula to add a comma beside each county. This finally made the delimiter work. For some reason, the generate custom list with the comma separator wasn't doing it. Thanks for the ideas.