Oh definitely, my townland is at least a couple of estates, at 100+ houses each.
And then there are the creatively named estates, where the whole street name is stop words. One near me has "[number] The Avenue", "The Court", "The Close", "The Drive".
Townlands are optional, or it can be the name of a large road near you. I think there are at least 3 addresses corresponding to my house that are used by official government mail, one of the things that EirCodes were supposed to prevent.