According to William's his death record, which may now be seen in familysearch.org, he died at the Wapello County Home, which was in a rural area of Wapello County, three miles north of Ottumwa. William's place of birth on that death record is Appanoose County, Iowa.

His obituary gives his place of birth as Pennsylvania. This is the place of birth that I originally showed on his memorial. The census records all show his place of birth as Iowa, and on his marriage certificate to Nellie Ireland Findley, William gave his birth place as Centerville, Iowa. After reviewing all of these records, I have changed his place of birth to Centerville, Iowa.

William was first married to Mary E. Mottoo on October 9, 1881, in Appanoose County, Iowa. After Mary's death, he married Nellie Ireland Findley, the daughter of J.W. and Mary (McNat) Ireland, on May 28, 1927, in Ottumwa.
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Obituary From Ottumwa Daily Courier, Thursday, February 29, 1940, Page 12:

W.W. STICKLER

William Wiley Stickler, 82, died at his home north of the city today at 8:50 a.m.

He was the son of Mr. and Mrs. William Stickler and was born in Pennsylvania [sic] January 7, 1858. He had lived in this community the last 29 years. He was a member of the Church of the Brethren.

Surviving are his wife, Nellie E.; daughters, Mrs. Ethel Dvorack, and Mrs. Ruth Elaine Debner of Davenport and Mrs. Goldie Eatwood of Dubuque; sons, Pearly E. and Willie E. Stickler of El Paso, Texas; five stepchildren; brothers Daniel of Osceola and Andrew of Centerville; sisters, Mrs. Mattie Peek of Mystic, Mrs. Rebecca Watson and Mrs. Ida Roby of Ottumwa.

The body is at Johnson's funeral chapel.
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"STICKLER SERVICES," From Ottumwa Daily Courier, Friday, March 1, 1940, Page 15:

Funeral services for William Wiley Stickler, 82, who died at his home north of the city Thursday, will be held Saturday at 1:30 p.m. at the Johnson funeral chapel, conducted by the Rev. Charles A. Albin. Burial will be made in Shaul cemetery.