Hello - I have seen a Francis Fountain in the 1880 census in Boone, in Boone County, Iowa, born around 1830 in New York.He was a restaurant clerk.His oldest child was born around 1860 in Illinois, his other children, much younger, in Iowa, include William J.
In 1870 he is listed in Montana (the town), Boone County, Iowa, born in New York, and is a bricklayer.
In 1860 he is in Galesburg, Knox County, Illinois, and is a bricklayer.
I did not see him listed in the 1850 census.
Does this sound like your Francis?Incidentally, there are Fountains who descend from the French Huguenot Fontaine family, Francis was a common name.I recommend visiting www.fontainemaurysociety.org for more information.