A production code is an identity for each and every episode of Duncanville assigned by the production team to help identify it from its respective season/episode number. Episodes are often broadcast by their production order i.e. in numerical order. This is a list of Duncanville episodes by production order, along with their broadcast season/episode numbers, and their original broadcast dates.
For the list of episodes by date, see here and for the list of episodes in alphabetical order, see here.