Individual Details

1 Jun 1860, P.O. Flint Hills, Cuivre Twp., St. Charles Co., MO, pg. 43;
John McCoy, head, 30 (1829-30), born MO, farmer. Owns no real estate, owns personal of $800
Ellen McCoy, 29 (1830-31), born MO
Ann McCoy, 9 (1850-51), born MO
William McCoy, 8 (1851-52) born MO
George McCoy, 7 (1852-53) born MO
James McCoy, 6 (1853-54) born MO
John McCoy, 4 (1855-56) born MO
Mary McCoy, 2 (1857-58) born MO
Lewis McCoy, 9/12 (Aug-Sep 1859) born MO
Edward Guiot, 21 (1838-39) born Louisiana, owns personal of $200. Married within the year.
Mary Guiot, 28 (1831-32), born MO. Married within the year.
Fanny McCoy, 63 (1796-97), born MO. Owns no real estate but has personal estate of $3, 000. Living with son John and his family. Her daughter Mary and her husband also appear to be in the household

1 Jun 1870, P.O. Wentzville, Cuivre Twp., St. Charles Co., MO, pg. 44;
John McCoy, head, 45 (1824-25), born MO, farmer, real estate of $7500 personal of $2000. Can read and write.
Ellen McCoy, 35 (1834-35), born MO
Anna McCoy, 20 (1849-50), born MO, no occupation
William McCoy, 18 (1851-52), born MO, farmhand
George W. McCoy, 17 (1852-53) born MO
James McCoy, 15 (1854-55) born MO
John J. McCoy, 13 (1856-57) born MO
Mary C. McCoy, 11 (1858-59) born MO
Louis McCoy, 10 (1859-60) born MO
Jasper McCoy, 8 (1861-62) born MO
Frances McCoy, female, 7 (1862-63) born MO
Elick McCoy, male, 5 (1864-65) born MO
Charles McCoy, 2 (1866-68), born MO
Jimie [?] McCoy, male, 1 (1868-69) born MO
Fannie McCoy, 70 (1799-1800), born MO, no occupation.

1 Jun 1880, Cuivre Twp., St. Charles Co., MO, ED 206 pg. 49A;
William McCoy, head, 27 (1852-53), married, born MO both parents born MO, farmer, next door to parents
Mary McCoy, wife, 26 (1853-54), born MO both parents born VA
Stephen McCoy, son, 2 (1877-78) born MO both parents born MO
Samuel McCoy, son, 6/12, born Dec (1879), born MO both parents born MO.

1 Jun 1900, Cuivre Twp., Audrain Co., MO, ED 2 Sh 8A;
William McCoy, head, born Feb 1852, 48, married 27 yr., born MO both parents born MO, farmer
Mary E McCoy, wife, born Apr 1853, 47, married 27 yr., born MO both parents born VA
James T. McCoy, son, born Sep 1881, 18, single, born MO both parents born MO, farm laborer [ancestry indexed middle initial as "F".]
Burtha [sic] McCoy, daughter, born Jun 1887, 12, born MO both parents born MO.

15 Apr 1910, Laddonia City, Prairie Twp., Audrain Co., MO, ED 7 Sh 1B; William D. McCoy, head, 58 (1851-52), marriage 1 of 36 yr., born MO both parents born MO, clerk - poultry house.
Mary E. McCoy, wife, 55 (1854-55), marriage 1 of 36 yr., mother of 9, 3 living, born KY both parents born VA
Horace McCoy, nephew, 19 ( ), single, born NO both parents born MO, Operator - Telegraph.

1 Jan 1920, Perry City, Salt River Twp., Ralls Co., MO, ED 157 Sh 9B;
William D. McCoy, head, 67 (1852), married, born MO both parents born MO, laborer - dairy farm
Mary E. McCoy, wife, 66 (1853), born MO both parents born VA.

Gedcom by Ray Richards has this:
ID: I1667
Name: William David McCoy
Sex: M
Birth: 25 FEB 1852 in St. Charles county, MO
Reference Number: 1667

Father: John McCoy b: 25 JAN 1829 in St. Charles county, MO
Mother: Ellen Ann Lewis b: 15 SEP 1830 in St. Charles county, MO
Marriage 1 Elizabeth "Lisa" Doss
Married: 8 OCT 1873 in Flint Hill, MO

But that doesn't fit the wife in 1880 census. While not proven that was this William, he was next door to these parents.

In 1910 census, Horace McCoy, 19, (1890-91), nephew, was living with William and Mary.

Birth	25 Feb 1852	Wentzville, St. Charles Co., MO
Census	1 Jun 1860	Cuivre Twp., St. Charles Co., Missouri
Census	1 Jun 1870	Cuivre Twp., St. Charles Co., Missouri
Marriage	Bet 1872 and 1874	Mary E. COLEMAN
Census	1 Jun 1880	Cuivre Twp., St. Charles Co., Missouri
Census	1 Jun 1900	Cuivre Twp., Audrain Co., Missouri
Census	15 Apr 1910	Prairie Twp., Audrain Co., Missouri
Census	1 Jan 1920	Perry City, Salt River Twp., Ralls Co., Missouri
Death	13 Mar 1925	St. Louis City, Missouri
Burial	24 Mar 1925	Laddonia Cemetery, Laddonia, Audrain Co., Missouri
Reference No		7829

Spouse	Mary E. COLEMAN (1853 - 1938)
Child	Stephen MCCOY (1877 - 1880)
Child	Samuel E. MCCOY (1879 - 1897)
Child	James T. or F. MCCOY (1881 - 1900)
Child	Bertha MCCOY (1887 - 1981)

Father	John MCCOY (1824 - 1887)
Mother	Ellen Ann LEWIS (1831 - 1904)
Sibling	Ann Missouri MCCOY (1850 - 1928)
Sibling	George Washington MCCOY (1853 - 1926)
Sibling	James Harrison MCCOY (1854 - 1870)
Sibling	John Jefferson MCCOY (1856 - 1930)
Sibling	Mary Catherine MCCOY (1858 - 1929)
Sibling	Lewis Wesley MCCOY (1859 - 1928)
Sibling	Jasper Davis MCCOY (1861 - 1916)
Sibling	Frances Elizabeth MCCOY (1864 - 1941)
Sibling	Alexander Lee Elick MCCOY (1865 - 1876)
Sibling	Charles Andrew MCCOY (1868 - 1946)
Sibling	Ellen Ann Virginia Jimie MCCOY (1868 - 1870)
Sibling	Clarisa Adeline MCCOY (1871 - 1875)
Sibling	Samuel Luther MCCOY (1873 - 1875)