The largest town in Ireland is called Dundalk, and there are 39,000 people who are living in this town right now, which is really large, especially when you would compare it to the other towns in Ireland. The smallest town in Ireland is Cape Clear, Country Cork. This is the southernmost island that you will find in Ireland, and this is only inhabited by 125 people.
It would be safe to assume that they know each other. The main reason why this is very interesting is that you will still see some signs of how this place used to be pre-Christian and also early Christian in Ireland. Aside from the history, you will also have a lot of fun bird watching around the island.