You can create functioning villages in the end and on top of the nether. I know this because I have a village finder mod which, tells me a functional village was present. Also, with the village I made in the end, an iron golem spawned. Could maybe be done in the end on survival, but I never tried.
MC-4696
Villages working oddly
Resolved
Works As Intended
1
Intended since you can transport villagers through portals.