Leahy's on Orphan Train to Iowa, 1899

I am looking for information about my great-grandparents, Michael and Mary (Kingston or Kenster) Leahy.I believe they were born in 1856 or 1857 in Ireland and immigrated to New York City. Their children were Julia, Mary and John.John, my grandfather was born in Manhattan in 1889.John and Mary came to Iowa on the Orphan Train in 1899.Julia did not.Does anyone know anything about the enumeration districts for the New York State Census for 1892.I would like to search the census, but have been told that I need to know the enumeration district. Can anyone help?
Carol