I have 2 barred rocks, 1 Rhode Island Red, 1 Gold Sex-link, & 1 Barr Orpington. I believe the Orpington is an heirloom but, I do not know about the rest. Does anyone know?
off the top of my head I would say they are not heirloom but can't confirm that. You could enter "Heirloom chicken breeds," in the search box and see what comes up.