He married twice. He married Margaret E. James in Northampton Co., VA, May 15, 1874. Margaret
was born in Northampton Co., VA 1852. Margaret was the daughter of Hezekiah Pettit James and Margaret Trower.
Margaret died before 1896. He married Mary Amelia Johnson in Northampton Co., VA, November 12,
1896. Mary was born January 27, 1877. Mary was the daughter of Littleton Wales Johnson and Margaret "Maggie" Virginia
Wyatt. Mary died April 4, 1933 at 56 years of age. (Bill Wilkins)
William John Mapp and Margaret E. James had the following child:
Judson Montague7 Mapp was born in Northampton Co., VA 1876.
William John Mapp and Mary Amelia Johnson had the following children:
Alf Johnson Mapp was born in Northampton Co., VA October 10, 1897.
William Haywood Mapp was born in Northampton Co., VA October 30, 1900. William died 1971 at 70 years of
Wyatt Slater Mapp was born June 26, 1908.
Hallett Wales Mapp was born in Accomack Co., VA March 18, 1913. Hallett died 1969 at 56 years of age. He married Itasca W.(wife of Hallett Mapp). Itasca was born 1916. Itasca died about 1980.