Sure do. You will find the sheet music to Shamus O'Brien (Will S. Hays, 1866) on this page at the UNC Chapel Hill site.

http://www.lib.unc.edu/music/white1/white1.htm

It is just a short ways down the page, right after Nora O'Neal, to which it is an answer song. The Chapel Hill site is not nearly so easy to navigate as the Levy site, but you will find that what is there is quite a bit easier to view.

The words aren't sung nearly often enough. Offhand, I can think of only Jim and Kim Lansford from Missouri. I have friends who perform it frequently, but as an instrumental waltz.