Extract from the 1860 Census:
Name: Amon Heacox
Age in 1860: 43
Estimated birth year:
Birthplace: New York
Race: white
Sex: male
Relation to head-of-house: servant
Living with: Albert and Louisa Cody, ages 26 and 22
Home in 1860: Nettle Creek, Grundy, Illinois
Post office: Morris
Occupation: farm hand
Census place: Nettle Creek, Grundy, Illinois; Roll M653_181; Page: 220; Image: 220; Family History Library Film: 803181
Date: 26 Jul 1860

Extract from American Civil War Soldiers:
Name: Amon Heacox
Residence: Newark, Illinois
Enlistment date: 13 June 1861
Distinguished service: distinguished service
Side served: Union
State served: Illinois
Unit numbers: 343 343
Service record: enlisted as a private on 13 June 1861
Enlisted in Company K, 20th Infantry Regiment Illinois on 13 June 1861
Mustered out Company K, 20th Infantry Regiment Illinois on 13 June 1864

Company K Twentieth Regiment Illinois Volunteer Infantry Roster and Record, written by Andrew Brown of Newark, Illinois, September 8, 1893 and published in the Kendall County Record published at Yorkville, Illinois, in 1894:
Amon Heacox, Lisbon, Illinois
Born in Oneida County, New York, June 6, 1817. Enlisted in Company K, May 1861, at the age of forty-four years. Mustered out July 14, 1864. Was the oldest man in the Company. I have been informed that he was slightly wounded at Britton's Lane, but I have no recollection of it. I remember him very distinctly at Fort Donelson. He was a good man and a good soldier. Was a member of M. E. Church. Was one of six, many years ago, to organize a Methodist Episcopal Church in Lisbon, Illinois. He died in the Soldier's Home at Quincy, Illinois, April 23, 1889, in the seventy-third year of his age. Is interred in the cemetery at Lisbon.

Extract from the 1870 Census:
Name: Amon Heacox
Age in 1870: 54
Estimated birth year: 1816
Birthplace: New York
Race: white
Sex: male
Relation to head-of-house: servant
Working for: Albert G Cody, age 37; farmer
Home in 1870: Nettle Creek, Grundy, Illinois
Post office: Morris
Occupation: farm laborer
Census place: Nettle Creek, Grundy, Illinois; Roll: M593_225; Page: 405; Image: 295
Date: 1 Aug 1870

Extract from the 1880 Census:
Name: Amon Heacox
Age: 62
Estimated birth year: 1818
Birthplace: New York
Race: white
Sex: male
Relationship to head-of-household: brother-in-law
Living with: Albert F and Louisa Cody, ages 47 and 43
Home in 1880: Prairie Green, Iroquois, Illinois
Marital status: single
Father's birthplace: New York
Mother's birthplace: New York
Occupation: farmer
Census place: Prairie Green, Iroquois, Illinois; Roll: T9_214; Family History Film: 1254214; Page: 343.4000; Enumeration District: 141; Image: 0468
Date: 7 Jun 1880
Note: Amon Heacox was Louisia Philomelia Heacox Cody's half-brother.

Amon Heacox was born ca 1818 in Oneida County, NY. On April 24, 1861, he enlisted as a Private in Company K of the 20th Illinois Infantry at Newark, Kendall County, IL. He was discharged June 13, 1864, in Quincy, IL, at the expiration of his term. On August 10, 1888, Amon was admitted to the Illinois Soldiers' and Sailors' Home in Quincy, IL, registered number 899. He died in the Home hospital on April 23, 1889. His admission paperwork lists old age and diabetes as his disability. He was 70 years of age, a resident of Nettle Creek Township, not married, no children under 16, and near relative as C. Heacox, brother. In a letter requesting admission written by P.A. Johnson, he stated that Amon Heacox had lived a bachelor's life, lived in Grundy County about 40 years except for a short time he lived in Dakota trying to make a success, but returned to Grundy when he was not successful. He also stated that Amon had signed notes as security for his brother-in-law and lost his property as a result of it leaving him destitute and a candidate for the poor house.
His height was listed as 5 feet, five inches; his complexion light, his eyes blue, and his hair white.

Obituary [probably from the "Kendall County Record" of Quincy, Illinois]:
The remains of Amon Heacox were buried here Friday afternoon. He died at the Quincy Soldier's Home on April 23, 1889, of general disability and old age. He served a couple of years in the 20th Ill. Vol., and had been in the Home for nearly a year. He was born in Oneida County, N.Y., August 10, 1817, and came to this country at a very early date. He was one of the original six that formed the First Methodist class in this village, and the last to die; the others were Mr. and Mrs. Wells, Jarvis Moore and wife and son, J.F. He was a devout and pious man all his life, and gave liberally of his means, no matter how meagre, for the benefit of the church. He has not been here much for quite a good many years, but made a short visit here about a year ago; and at that time was very feeble, and, as we believe, sought the comforts of the Soldier's Home, as a matter of choice, to end his last days. He was a half-brother to Charles Heacox, and it was at his insistence that the body was brought here and placed beside his father and mother, who had gone many years ago.