Individual Details

In 1880 Dewitt and Mary had no children. They were in White Twp, Polk Co, AR. William McCoy, age 13, born in Texas, was living with them - this was apparently the three-year-old that lived with Peter B. in 1870.
Dewitt C., age 26, b. AR, parents b. NY, Farmer
Mary J., wife, age 21, b. NC, parents b. NC
William McCoy, age 13, b. TX

Apparently Mary died or they divorced because he married Lou ??? about 1890 according to the 1900 and 1910 Censuses.

Lived in Arkansas City, Kansas, in 1901, according to father's obituary.

1900 Census, Kansas, Cowley Co. Arkansas City, Ward 1
DeWitt Allen, b. Jul 1854, age 45, married 10 years. b. Illinois, parents b. NY
Lou, wife, b. Aug 1869, age 30, no children, b. KY, parents b. KY

1906 Arkansas City and Cowley Co Directory
Allen, De Witt C., wf. Lou, contractor, building, residence: 222 N C

1910 Census. Kansas, Cowley Co, Arkansas City, Ward 1
DeWitt C. Allen, age 56, married 1 time for 20 years. b. AR, parents b. NY
Lou, wife, age 41, b. KY as were her parents.

Kansas State Census, 1915
Arkansas City, Cowley Co. Family 53
D. C. Allen, 60, b. AR, came to Kansas from Illinois, Contractor
Lou Allen, 45, b. KY, came to Kansas from Kentucky
George Wilson, 58, b. Illinois, came from Illinois, Laborer

USGenWeb, Cowley Co, Kansas website shows Dewitt C. Allen, birth date, 20 Jul 1854, buried in the old section of Riverview Cemetery. No death date given. There were five Mary Allens buried there, including one Mary J. Allen. The location of the graves are given and none of the Marys are buried next to DeWitt.
Picture of a very nice monument added to FindAGrave. Death date was 19 May 1918; Riverview Cemetery, Arkansas City, Cowley Co, Kansas.

The Civil War pension file of his brother Augustus, includes an application of the widow for reinstatment of her pension and Dewitt Allen, who had testified earlier, in the 1880's, was deceased before 1921 when a special examination of the application was conducted.

Birth	20 Jul 1854	Cove, Polk County, Arkansas
Marriage	Bef 1880	Mary J. [ALLEN]
Marriage	1890	Lou [Allen]
Death	19 May 1918	Cowley County, Kansas

Spouse

Mary J. [ALLEN] (1859 - )

Spouse

Lou [Allen] (1869 - )

Father	PETER BUELL/BENTON ALLEN (1811 - 1901)
Mother	MARY ROWENA HOSKINS (1815 - 1885)
Sibling	Augustus A. Allen (1841 - 1882)
Sibling	Henry Clay Allen (1843 - 1912)
Sibling	Nathaniel Orrin "Nat" Allen (1844 - 1933)
Sibling	Peter B. P. "Port" Allen (1846 - 1926)
Sibling	Mary Adeline "Addie" Allen (1848 - 1936)
Sibling	Charles Edward Francis Allen (1850 - 1905)
Sibling	Martha Elizabeth Allen (1852 - 1936)
Sibling	PHILENA JOSEPHINE "JOSIE" ALLEN (1856 - 1935)