Thanks for thinking candies TW.
So 2 minute research shows 2 candy associations / networks in USA:
http://www.pmca.com/
http://www.candyusa.com/
If you call them and give them a location or some idea about what kind of candy you're looking to get made, they will connect you with a couple of their members.
Also found:
http://www.candydetective.com/
but didn't investigate further.
Also - another way to find manufacturers of candy is to look at the packaging of competitor candies. A lot of your competitors may not have their own plants - so they will be outsourcing their manufacturing too.