I just rechecked the 1870 census and find that William Boundy's wife was named Elizabeth, also born in England as well as a 16 year old son, William, English born. They lived in Peach Orchard, Ford County, Illinois. At that time he was listed as 39, which would make his birth date about 1831/32

Also in Peach Orchard was John Boundy, his wife was Eliza Jane. She was born in Indiana. John was listed as age 38. We know that John had an older brother named William. It would seem reasonable that John and William were brothers since there are not that many Boundy's to be found in 1870 paired up in small communities.

We know that John was from England. Devon we believe.

We also know that William's wife returned to England alone on several occasions to visit family. A formidable woman considering travel in the last half of the 19th Century.

I will continue to look back and see what I can confirm about the English location.

Again, thanks for the original reply.