Kate's Notes: The "O.C." Gilliland of this obituary was Dr. Orange Gilliland, a son of George A. and Charity Gilliland. Additional information such as census records are provided below the obituary.

From The Washington Post, Tuesday, March 6, 1906

Now Rests In Glenwood
  
  Funeral of Dr. O.C. Gilliland, who died March 1, was held at the residence of his parents, Mr. and Mrs. G. A. Gilliland, 616 Eleventh street northeast, at 11 a.m. yesterday. It was largely attended, and there were many floral tributes, showing the esteem in which Dr. Gilliland was held.
   Rev. G. C. Bacon, of Douglas Memorial Church, officiated. The Maccabees, of which Dr. Gilliland had been a member for seven years, participated, using the rites of the fraternity. The Modern Woodmen of America were also represented by a delegation, he having been a member of that order for eighteen years. Interment was in Glenwood Cemetery.
   Dr. Gilliland was born near Beaver, Pike County, Ohio, December 28, 1869. The family removed to Illinois in 1871, and he was a legal resident of that State up to the time of his death.
   He was always of a studious disposition. Even as a child, only seven years of age, his teacher was frequently compelled to take his books from him during school hours, to prevent him from too close application, and that trait he carried through life.
   Dr. Gilliland received a certificate as a teacher when only fifteen years old, and began work in the schoolroom at once. He followed that profession in Vermillion County, Ill., until 1891, when he received an appointment in the Department of Labor, this city. He was promoted to $1,600 per annum July 1, 1905. His services were marked by faithfulness and thoroughness. He was very highly respected by his superiors and fellow-clerks, and was held in high esteem by a large circle of acquaintances.
   Dr. Gilliland leaves a widow, but no children survive him. His only child, Carroll Blaine, died January 17, 1899. His health had been declining since January 1, 1905, but he continued at work, and on October 1 last he was sent to Tennessee to investigate the coal strikes of that State. He contracted a severe cold, which developed into pneumonia November 17, while in Knoxville. He was brought to the home of his parents Janury 10, and was confined to his bed until the end.

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Directory of Deceased American Physicians, 1804-1929
Orange C. Gilliland
Name: Orange C. Gilliland
Birth Date: 1870
Death Date: 1 Mar 1906
Death Place: Washington, DC
Type Practice: Allopath
Licenses: DC, 1895
Medical School: George Washington University School of Medicine, Washington: Columbian Univ. Med. Dept., 1894, (G)
JAMA Citation: 46:904
Cause of Death: disease, lungs

(An "allopathic" physician could be considered an outdated classification and might be compared to a practitioner of homeopathy. Such practitioners were held in derision by the medical community of the day, which may be why any references to Dr. Gilliland's medical school training was omitted from his obituary. That is only speculation on my part, however.)

1880 census for Vermillion County, Illinois
G. A. Gilliland, 30 yrs, and wife Charity E., 28 yrs*, with children Orange, 10; Henry, 8; George W., 5; Nancy F., 2.
* Charity E. (Butcher) Gilliland

1900 census for the District of Columbia
Orange C. Gilliland, 30 yrs and wife Amy E., 28 yrs*
*I do not have the maiden name for O.C.'s wife Amy.

1910 census for the District of Columbia
George A. Gilliland, 60 with wife Charity, 58; son George W., 24; daughter Ada B., 21*; grandaughter (first name illegible) Marguerite, age 7.*

*Some of the dates in this 1910 census simply don't add up. Son George W. would have been 34 or 35 y.o.; Ada B. was listed as a daughter in the 1910 census but I have to wonder if she was actually a daughter-in-law. And there is no clue to whom the grandaughter might belong. 

Pedigree of George A. Gilliland, father of  Dr. Orange C. Gilliland:
(This Gilliland family from Jackson County, Ohio)
Father: 
NATHAN GILLILAND 
Mother: 
CATHERINE "Katy" ADAMS

Grandfather:
SAMUEL GILLILAND
Grandmother:
SARAH KROUSKOP