Her death certificate indicates that she was 81 at the time of her death, which puts her birth year as 1843, not 1848 as stated on the certificate. 1843 is also consistent with the 1900 Census.
Sources
↑ 1.01.1Death Certificate "California, County Birth and Death Records, 1800-1994", citing Digital film/folder number: 005587985; Image number: 1456, FamilySearch Record: QLBP-5LGL (accessed 7 February 2024) FamilySearch Image: 3QS7-89SX-S8HF, Mary R McKinely death 12 Feb 1925 (age 81), daughter of George Ingman, wife of William McKinley, in Los Angeles, California, United States.
↑1850 Census "United States Census, 1850", citing Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: M432; Line: 10; Digital film/folder number: 004204481_002_M9CN-JNV; FHL microfilm: 444685; Image number: 17; Packet letter: A; Indexing batch: N01131-7, FamilySearch Record: MXQ8-3WG (accessed 7 February 2024) FamilySearch Image: S3HT-6SR9-PV8, Mary R Ingman (7) in Kenton, Hardin, Ohio, United States. Born in Ohio.
↑Marriage "Iowa, County Marriages, 1838-1934", citing Digital film/folder number: 004309820; FHL microfilm: 000986805; Packet letter: E; Indexing batch: M02542-9, FamilySearch Record: XJVY-4H7 (accessed 7 February 2024), Mary Ingman marriage to William Mckinley on 20 Dec 1871 in Cedar Co., Iowa, United States.
↑1900 Census "United States Census, 1900", citing Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: T623; Line: 45; Digital film/folder number: 004120100; Image number: 469; Sheet number: 8; Sheet letter: A, FamilySearch Record: M924-KC9 (accessed 7 February 2024) FamilySearch Image: S3HT-6SMW-P2X, Mary R McKinley (57), wife, in household of William McKinley (56) in Cass Township, Cedar, Iowa, United States. Born in Ohio.
1880 Census "United States Census, 1880", citing Volume: 2; Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: T9; Affiliate Line Number: 00059; Digital film/folder number: 005160593; FHL microfilm: 1254331; Image number: 321; Sheet number: 56; Sheet letter: B; Packet letter: E, FamilySearch Record: MDK1-GWT (accessed 7 February 2024) FamilySearch Image: 33SQ-GYBW-9QD2, Mary Mc Kinley (36), wife, Keeping House, in household of William Mc Kinley (35) in Cass Township, Cedar, Iowa, United States. Born in Ohio, United States.
1885 Census "Iowa State Census, 1885", citing Page: 4; Line: 21; Digital film/folder number: 004539578; FHL microfilm: 1021450; Image number: 11; Packet letter: A; Indexing batch: N00985-0, FamilySearch Record: HHR4-KW2 (accessed 7 February 2024) FamilySearch Image: 939Z-YLZM-B, Mary McKinley (41) in Cass Township, Cedar, Iowa, United States.
1920 Census "United States Census, 1920", citing Affiliate Name: The U.S. National Archives and Records Administration (NARA); Affiliate Publication Number: T625; Line: 5; Digital film/folder number: 004965860; FHL microfilm: 1820482; Image number: 601; Sheet number: 1; Sheet letter: A; Packet letter: A; Indexing batch: N01918-8, FamilySearch Record: M8BH-ZFV (accessed 7 February 2024) FamilySearch Image: 33SQ-GR6N-NHM, Mary McKinley (76), wife, in household of William McKinley (75) in Cass Township, Cedar, Iowa, United States. Born in Ohio.
Monumental inscription. Mountain View Cemetery and Mausoleum, Altadena, California. 1925 (b. 184e) MCKINLEY, Mary. Photographed by: Find A Grave contributor Kate, ID 47160760.
Acknowledgements
Gravesite photo posted with permission of Find A Grave contributor Kate, ID 47160760 as noted in email response to request to use her images on WikiTree: "Permission granted."
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