Jabez Barnum, brother of Stephen and Thomas, served during the Revolutionary War. He was a member of the Albany County Militia, Colonel Van Rennselaer's 4th NY Regiment.
According to Massachusetts Soldiers and Sailors in the War of the Revolution: Barnum, Jabez, Private, Capt. Daniel Brown's co., Col. Benjamin Simonds's regt.; enlisted Oct. 20, 1780; service, 3 days; marched on an alarm at Berkshire.
According to the History of the town of Shoreham, Vermont: from the date of its charter, October 8th, 1761, to the present time, "Jabez Barnum, from Lanesboro, Mass., settled on the farm where Deacon Lewis Hunt now lives, in 1787 ; left that place about 1796, when he moved on to the the place now owned by William Penn Frost. He died at that place".
The Barnum Family, 1517-1904 mistakenly shows Jabez as a son of Thomas Barnum (born 1735).