I think (no proof) that he was originally Milo D. Forrest or Forest, but people interpreted that as Milo DeForest. I think this is him, probably with his parents and sister in the 1870 Census in Great Barrington, Berkshire Co., MA, which is next to New Marlborough, MA.
In 1880 he is a ward to a family in Connecticut Ancestry.com - 1880 United States Federal Census
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A quick search of Ancestry reveals a several census records for Milo Deforest.
According to the 1900 Census, Milo Deforest was 30 years old and living in New Britain, Hartford, Connecticut. He was living with his wife Fanny M Deforest (married in 1897). He was a farm laborer.
According to the 1920 Census, Milo De Forest was 52 years old and living in Lee, Berkshire, Massachusetts. He was living in his brother-in-law’s (Walter Frink) household. He was a laborer in the lumber industry.
Ancestry.com is a subscription based service. However, many public libraries as well as National Archives research rooms have access to Ancestry.com for their patrons.
Hopefully, this information will allow you new places to start in your continued research on Milo Deforest. Best of luck to you!
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Possible Match. Milo Forest a boarder and widow age 60
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I found an obituary for Milo DeForest on newspapers.com. I do not have a subscription to this site so I can only show you a snippet. They do give a free trial to new subscriber.
The Berkshire Eagle
Monday, March 02, 1964
2 of 4 matches on this page.