While this was in Ireland, it's worth specifying that Royal Mail was responsible for this wholesome delivery as it was in Northern Ireland (currently in the UK), so it's not immediately obvious that this applies to the Republic as well.
Incidentally the Republic of Ireland didn't have a nationwide postcode system until 2015.
Prior to that I used to address letters to a relative there as Name, Village, County and they were delivered! Turned out there were two people of the same name in the village but the postie saw the UK-originating stamp on the letter and ,delivered to the applicable one.
Around the same time as the Eircode was introduced, water meters were installed for every property in Ireland. They have never been used, because of public outcry over the idea of being charged for water use. Don't imitate Ireland.
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.