1900 Census, Sheridan Dist., Calhoun Co., WV, June 12:
Cooper, Wm. M., head, b. Jan. 1859, 41, m. 20y, b. WV, parents b. WV, farmer
Sarah D., wife, b. Sept. 1863, 36, m. 20y, 7 children/7 survive, b. WV, parents b. WV, housekeeper
Zanas O., son, b. July 1881, 18, b. WV, farmer
Ellen F., dau., b. Dec. 1883, 16, b. WV, housekeeper
Cyrus H., son, b. Dec. 1885, 14, b. WV, farmer
Orpha F., dauu., b. Mar. 1889, 11, b. WV, housekeeping
Alvin N., son, b. July 1891, 7, b. WV, at school
Cloe D., dau., b. Oct. 1894, 5, b. WV, at school
Jessie R., son, b. Dec. 1896, 3, b. WV, at school

1910 Census, Sheridan Dist., Calhoun Co., WV
Cooper, William M., head, 51, m. 29y, b. WV, father b. PA, mother b. unknown, farmer
Sarah D., wife, 46, m. 29y, 8 children/8 survive, b. WV, father b. WV, mother b. VA
Orpha S., dau., 21, single, b. WV
Alvin M., son, 17, b. WV, farm laborer, home farm
Della, dau., 15, b. WV
Jessie R., son, 13, b. WV, farm laborer, home farm
Laura L., dau., 8, b. WV

1920 Census, Murphy Dist., Ritchie Co., WV
Cooper, WIlliam M., head, 61, b. WV, father b. PA, mother b. WV, merchant, general store
Sarah D., wife, 57, b. WV, father b. WV, mother b. VA
Jessie R., son, 23, single, b. WV, clerk, father’s store
Delany, Cyrus, father-in-law, 81, b. WV, father b. WV, mother b. VA
Susan, mother-in-law, 80, b. WV, father b. WV, mother b. VA

1930 Census, Vienna, Williams Dist., Wood Co., WV
Cooper, WIlliam M., own home, $2500, 71, married at age 21, b. WV, father b. PA, mother b. WV
Sarah D., wife, 66, m. at age 17, b. WV, father b. WV, mother b. MD

Death Certificate
Name: William M. Cooper
Date/Place of death: May 11, 1939, St. Josephs Hospital, Parkersburg, Wood Co., WV
Residence: 611 Lexington, Vienna, Wood Co., WV
male, white, married
Spouse: Sarah Dorcas Dotson
Date/Place of birth: Jan. 20, 1859, Tyler Co., WV
Age: 80y, 2m, 21d
Occupation: retired, mercantile business
Father: Reece Cooper, b. Tyler Co., WV
Mother: Clara Grimm, b. Tyler Co., WV
Informant: J. R. Cooper, Parkersburg, WV
Cause of death: pneumonia — ?, following prostatectomy
Date/Place of burial: May 14, 1939, Arlington Cemetery, Parkersburg