Alexander married Rebecca Lavinna Mace on 24 Jan 1854 in Wapello Co., Iowa. Rebecca (daughter of Simeon Edgar Mace and Nancy Margaret Lemar) was born on 10 Sep 1832 in Muskingum, Muskingum, Ohio; died on 24 Oct 1930 in Los Angeles, Los Angeles, California; was buried in 1930 in Los Angeles Co., California. [Group Sheet]

1. Mary Ann McCullough was born on 4 Apr 1855 in Bloomfield, Davis, Iowa; died in 1932 in Allerton, Wayne, Iowa.
2. Olive Jane McCullough was born in 1856 in Wapello County, Iowa; died in 1885.
3. Jonathon F. McCullough was born in 1859 in Wapello County, Iowa; and died.
4. Amanda Louise McCullough was born in Mar 1859 in Wapello County, Iowa; and died.
5. William R. McCullough was born in 1862 in Wapello County, Iowa; and died.
6. Lucinda Malone McCullough was born on 7 Aug 1864 in Ottumwa, Wapello, Iowa; died on 13 Feb 1937 in Olathe, Johnson, Kansas.
7. Margaret Elizabeth McCullough was born in May 1866 in Wapello County, Iowa; died on 7 Sep 1940 in Iowa.
8. Helen Maude McCullough was born in 1867 in Wapello County, Iowa; and died.
9. James B. McCullough was born in Nov 1871 in Wapello County, Iowa; died in 1925 in Kansas.
10. Hannah Julia McCullough was born in 1872 in Wapello County, Iowa; and died.
11. Sarah C. McCullough was born on 30 Apr 1873 in Wapello County, Iowa; died on 3 Oct 1874 in Wappello Co., Iowa.
12. Lydia Eldora McCullough was born in 1875 in Iowa; and died.
13. Oliver M. McCullough was born in May 1879 in Iowa; died in 1902 in Kansas.