Married Matilda Lyne on 14 NOV 1837 in Nelson County, Kentucky or Versailles, Woodford County, Kentucky.

From Ancestry RootsWeb WorldConnect:
MILITARY:
John Sanford Duncan served in the 11th Missouri State Militia Cavalry as Commissary Sergeant during the 1860's, according to the discharge papers of Henry Bascom Dines, held by James Scott. Duncan, John S., I 2 MO S.M. Cav. Com. Sgt. & A 11 MO S.M. Cav.; 1890 July 5, Invalid Appl. #790893, Cert. #553668, Ill. (Mary Ann Dobson research: ? 1850 Shelby Co. MO census).
11th REGIMENT MO STATE MILITIA CAVALRY (MSM).
Organized In Missouri at large January 1 to April 20. 1862. Assigned to duty in District of North Missouri.
SERVICE.--Actions at Cherry Grove June 26 and July 1. Near Memphis July 18. Newark August 1 (Detachment). Kirksville August 6 (Detachment). Near Stockton August 8 (Detachment). Consolidated with 2nd Regiment Missouri State Militia Cavalry September 2,1862, which see.
Source of Data: "A Compendium of the War of the Rebellion, V.III" by Frederick H. Dyer, c1908, p.1310
Copyright (c) 1998

HISTORY:
Shelby County, MO was organized 2 Jan 1835 from Marion County. Named for Gen. Isaac Shelby, who fought at King's Mountain, in the Revolution, and was subsequently Governor of Kentucky. The first county seat was at Oak Dale, but was moved to Shelbyville in 1836.
"JOHN SANFORD DUNCAN (Postmaster, Shelbyville). For 17 years continuously Mr. Duncan has had charge of the postoffice at Shelbyville, and for 43 years he has been one of the respected and worthy citizens of the county. Now in the afternoon of life and soon to enter the ark of the evening horizon, he can look back ... Mr. Duncan was born in Nelson Co. KY, February 1, 1815. His parents were George and Nancy (Connelly) Duncan, both originally from Virginia. Reared in Kentucky, November 14, 1837, he was married to Miss Matilda Lyne, a daughter of Thomas and Mary (Connelly) Lyne, of Woodford county. In 1840 he came to Missouri and settled in Shelby county in the spring of the following year. ..."
Source:
"History of Monroe and Shelby counties, Missouri ... : including a history of their townships, towns and villages together with a condensed history of Missouri ... biographical sketches of prominent citizens" pub. by National Historical Co. (FHL book 977.832 H2h; and from index cards of Kit Smith 1984), Pg. 907-908.

OBITUARY:
From a Funeral Notice in the Scott Family Bible, held by James Scott: "The funeral services of John Sanford Duncan will take place from the Berean M.E. Church in Shelbyville, Mo., on Friday, Feb. 9, 1906, at 3:30 P.M., conducted by Rev. J.M. O'Bryen, assisted by Revs. W.H. Burris and J.J. Reed. Buriel I.O.O.F. Cemetery. Born in Bloomfield, Nelson County, Ky., Feb. 1, 1815; died at his home in Shelbyville, Mo., Feb. 8, 1906. Aged 91 years, 7 days."

Died Yesterday.
John S. Duncan for 65 years a resident of this county died at his home in Shelbyville yesterday morning, being at the time of his death a few days past 91 years old. He was born in Nelson county, Kentucky Feb. 1st, 1815 and came to Missouri in 1840 and to Shelby County the following year and for 16 years lived on a farm near Bacon Chapel and then moved to Shelbyville where he continued to live until his death. In 1861 he enlisted in the Union army and served until near the end of the war when he was appointed Circuit clerk and Recorder which position he held two years. Later he was for about 20 years postmaster at Shelbyville. He is survived by the following children: Mrs. J. H. Vanskike of near Kirby, George S. Duncan of Kansas City, Mrs. H. B. Dines and C. B. Duncan of Quincy. Mrs. N. C. Miller and Miss Lillie Duncan of Shelbyville. Mr. Duncan was a member of the M. E. Church and the funeral will be held in that church at Shelbyville this afternoon at 3:30 o'clock.
The Shelbina Torchlight, Shelbina, Missouri, February 09, 1906, Page 1, Column 3

An Old Citizen Gone.
John S. Duncan, one of the oldest citizens of Shelbyville, died at his home in this city Thursday, Feb. 8, 1906, at 6 a.m. at the ripe old age of 91 years. Uncle John S., as he was familiarly called, had been in very poor health for several months and grew weaker day by day until the summons came which relieved him of all pain and worldly cares.
He was born in Nelson Co., Ky., Feb. 1, 1815, and came to Missouri in 1840 and the following year located in Shelby county on a farm near Bacon Chapel where he lived for 16 years and then came to this city where he continued to live until his death. He enlisted in the Union army in 1861 and served until near the close of the war. He served as Circuit Clerk and Recorder of this county for two years and afterwards was postmaster in this city for nearly 20 years.
He was married to Matilda Lyne in Woodford county, Ky., Nov. 14,1837. To this union were born 10 children, 6 of them now living —Mrs. J.H. Vanskike of near Kirby, Geo. S. Duncan of Kansas City, Mrs. H.B. Dines and C.B. Duncan of Quincy, Mrs. N.C. Miller and Miss Lillie Duncan of this city. The deceased was a member of the M.E. Church and lived a christian life.
The funeral services were held at the Berian M.E. church in this city on Friday, Feb. 9, at 3:30 p.m. conducted by Rev. J.M. O'Bryen, assisted by Rev. J. J. Reed. The burial took place at the I.O.O.F. cemetery.
Shelby County Herald, Shelbyville, Missouri, 14 Feb 1906, Page 3, Col. 6

Our Local Pen Points.
— John S. Dungan died in Shelbyville last week at the age of 91 years. He had lived in Shelby county most of the time. Solomon Evans is the oldest man in Shelby county, his age being 94 years.
The Knox County Democrat, Edina, Missouri, 16 Feb 1906, Fri; Page 1, Column 4