Dublin in Ireland does not have zip codes. However, different parts of the city and its suburbs are divided into postal districts, ranging from Dublin 1 to Dublin 24. Lower numbers are nearer the centre of the city. Odd numbers are on the northside of the city, which is divided by the river Liffey, and even numbers are on the southside.
The phone number of the Dublin Branch Library is: 614-645-2275.
The phone number of the Dublin Public Library is: 765-478-6206.
The phone number of the Dublin Laurens Museum is: 478-272-9242.
The phone number of the Dublin Historical Museum is: 254-445-0200.
The phone number of the Dublin Historical Society is: 614-764-9906.
The phone number of the Dublin Historical Society is: 603-563-8545.
The address of the Dublin Library is: 200 Civic Plaza, Dublin, 94568 2619
Lucan is in county Dublin, and does not have a postal area number. You would end an address to anywhere there as: Lucan, County Dublin.
Dublin has a number of castles. The most famous in Dublin castle, in the city. There is also Malahide Castle in the north of the county of Dublin.
There are a number of castles in Dublin. The main one is known as Dublin Castle. Malahide Castle is another castle in Dublin.
Parts are in Dublin 9 and other parts in Dublin 11. Using either will get your post to there.
Dublin is one county, so there is only one county in Dublin. There are a number of administrative areas in county Dublin, but these are not counties.