I'm creating a form, and want to have our clients select from a list of counties, but allow them to be able to select multiple counties. Preferably the list would be a drop down, but I am open to other options. The only thing I've been able to manage so far with the drop downs is to just select a single option.

A messy workaround would be to list all 88 counties (thanks Ohio) with a checkbox next to each one, but that would make it a pain for me to have to read through all of the counties to find only the ones they selected.

You can put a dropdown content control inside a repeating section content control to get that functionality.
This youtube video will give you an idea of how it works https://www.youtube.com/watch?v=XxU1e6hUF1E

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Andrew Lockton
Chrysalis Design, Melbourne Australia