Vanko and Krupec located in Slovakia
After 44 years of searching, today I learned that Jan Vanko was born 17 May 1866 in Laskar, parish Blatnica, township (okres) Martin, district (kraj) Zilina, Slovakia. His father was Jano Vanko of Klecseny, now called Turcianske Klacany, township (okres) Martin, district (kraj) Zilina, Slovakia, where there are Vankos in the telephone book today. His mother was Catharina Krupec, also of Laskar, where multiple Krupec's are listed in the Census of 1715.
Thanks to Zlatica and Judy for your help.
I plan to visit these villages in 2013.