There’s a Dublin in Georgia – I remember the Redneck Games (or similar) being held there during the Atlanta Olympics. My atlas only mentions one other Dublin (in Texas) apart from the one Cabbage mentioned.
As for your questions, the best I could do for the Three Castles one was this site, which claims that they were Blessington, Poulaphuca and Ballymore Eustace in the Glen of Kildare. Lots of sites say that three castles have appeared on the Dublin coat of arms since ancient times, and have been amended slightly in the light of various historical events. No doubt Google will help you did deeper if needs be.
According to this site you were right with your guess about the Union Jack.
I’m sure there are plenty of other Dublins around the world.
The SOED defines jackeen as a “self-assertive worthless person, specifically a city-dweller”. It comes from jack (meaning “a man”, as in steeple jack, jack of all trades, etc) and -een an Irish diminutive suffix (as in poteen, colleen). No mention is made of the Union Jack.
Populated places called “Dublin” in the U.S. (most of them not actually cities):
Dublin, North Carolina
Dublin, New Hampshire
Dublin, New York
Dublin, Franklin County, Ohio
Dublin, Mahoning County, Ohio
If you are interested in the Dublins of the US there is a book by Joseph O’Connor called “Sweet Liberty Travels In Irish America” in which he visits 9 Dublins in the US, he is of the impression that there are only 9 (well actually it may have been 11) Dublins in the US as far as I recall but it is an interesting read, especially when he asks residents where they thought the name Dublin came from, it seems as if not all of them were settled by Irish people, or if they were the history was lost.
Yes, Dublin Ohio is a real city. It is a northwest suburb of Colunbus Ohio known for lots and lots of office buildings, as well as upscale housing.
We have a pub called the Brazenhead that was supposedly brought brick by brick from Ireland. While you can get lamb stew at the pub, you won’t be able to find corn beef and cabbage in Dublin Ohio except on St. Pat’s Day.
Also don’t miss seeing the giant concrete ears of corn statues when you visit Dublin Ohio! whoopie!
I am not surprised by the size of the band. Dublin Ohio charges a 2% income tax on anyone working in Dublin (no matter where they actually live). With the sizable companies here, that turns into a tremendous amount of income (Not to mention the tax from the high property values). Dublin schools are therefore very popular.
To think, not so long ago Dublin Ohio was just farmland… Then enter the developers…
I can guarantee that there is a Dublin, TX, and it’s tiny. (had a family reunion there a couple of years ago…) Other than that, I’m afraid I can’t help you… However, you can take a world vacation just by driving around in Texas…you can visit Dublin, Paris, Rome, Corinth, Moscow, Troy…I wouldn’t be surprised if somewhere there was a Reykjavik, Texas…
I would be surprised if there wasn’t some town in every state called “Dublin” even if it’s too small to show up in any map or atlas…a lot of Irish settled all over the US, and even those who weren’t Irish were in the habit of naming their little towns after famous European cities.