As you can see by the previous replies, the Kmetz name is fairly common among late 18th century immigrants. My ancestors were from Saros Megye (Vizny Orlich) in what is today NE Slovakia. They were originally Eastern Rite Catholics, many of whom became Russian Orthodox. I have a Mike Kmetz listed in the household with my known ancestors Eva, George & Peter on an 1895 Passaic, NJ census, but we do not know who he is. There is also a Kmetz headstone for my family in a cemetery in NJ where my grandfather & others are buried. A different Kmetz family that includes a Father, son Michael C.(1902-1983), wife Mary (1876-1946), Husband Mike (1860-1914), Daughter Helen & Son Rudolph are also buried there, because the name is the same & the cemetery was used by the church both families attended, but we are not related as far as I can tell.
In any event, good luck in your search. The person replying to your question before me has been very helpful to me in referring me to Carpatho-Rusyn research sites. She should be a good resource.
Beth