In the US Census of 1860 for Fennimore, Grant, Wisconsin, George and his wife Mary were enumerated as follows:
Dwelling #305; Family #305
G. P. Barnum, 28, Male, Farmer, Real property $1,000, Personal property $400, b. New York, Married within the year
Mary Barnum, 17, Female, b. New York, Married within the year
Note: George's brother Doctor, his family and the father of the two brothers were all enumerated next door, in Dwelling #306.
From Valley of the upper Maumee River, with historical account of Allen County and the city of Fort Wayne, Indiana. 1889. Madison: Brant & Fuller, Volume 2: Dr. George P. Barnum, the well known veterinary surgeon and liveryman, was born in Keeseville, N. Y., July 18, 1831, the son of Platt and Hannah (Hull) Barnum, both natives of Vermont. When he was but six months old, his parents removed to West Chateaugay, Franklin County, N. Y., where his boyhood was spent on a farm. At the early age of thirteen he started out for himself and made his way to Burlington, Vt. where he secured a position in the veterinary hospital of William I. Richardson, a prominent surgeon of that vicinity, and a graduate of a college in London. He remained there until he was nearly twenty-one years of age, having had full charge of the establishment after he reached the age of sixteen. He removed to Milwaukee, Wis., arriving there November 1, 1852, and soon afterward to Madison, where he was for one year employed by the month in his profession. Going to St. Paul, he practiced his profession one year, and then moving to Grant County, Wis., farmed and practiced until 1861. In April of that year, he engaged in the livery business at Marion, Iowa, and remained there until October, 1865. He continued to practice his profession, and in 1868, went to Omaha, Nebraska, and conducted a stable and practiced until April, 1870, when he came to Fort Wayne. Until 1871, he gave his time here to the profession, but in that year began the management of a large livery barn, to which he has given much attention in connection with the breeding and training and campaigning of fast horses. Mr. Barnum was married March 15, 1852, to Eliza Curtis, of Burlington, Vt.; she died in October, 1856, and March 1, 1857, he married Mary White, of Jones County, Iowa. She died in October, 1866, and on Christmas Eve, 1871, he was married to his present wife, Selina Mercer, of Owasso, Mich. He had one child by his first wife and two by his second, but all are dead. He has adopted three children, since deceased. He is in politics a Republican. While in Wisconsin he served five years as deputy sheriff. Mr. Barnum is a second cousin of the veteran showman, P. T. Barnum (N.B., fourth cousin, once removed).
From the Fort Wayne Sentinel, Fort Wayne, Indiana, October 1, 1891: Dr. G. P. Barnum, the well-known liveryman, died at his home on East Columbia Street this morning at 10 o’clock of gangrene or blood poison. Dr. Barnum was among the best known Veterinary surgeons and horsemen of northern Indiana. He had been suffering the past few years from irregularities of the system, and had resorted to various treatments to find relief, but with few favorable results. For some time past he was not very active in business, being unable some of the time to leave the house. His last illness covered a period of ten days.