Hi @Coleman Milliganโ 
Checking the old unanswered questions and stumbled across this. 
You can do that using the databricks widgets. 
dbutils.widgets.dropdown("state", "CA", ["CA", "IL", "MI", "NY", "OR", "VA"])
If this widget is not helping you in passing parameters, you can do a try catch in all the notebooks to check if the parameter value you are passing is actually in the list of strings you have.
Hope this helps.
Cheers.
					
				
			
			
				
	Uma Mahesh D