When Benjamin Cobb was born on 8 December 1818, in Jamaica, Windham, Vermont, United States, his father, Benjamin Cobb, was 32 and his mother, Subinita Burt, was 26. He married Harriet Martin on 20 February 1844, in Jamaica, Windham, Vermont, United States. They were the parents of at least 3 sons and 2 daughters. He died in June 1899, in Millington, Tuscola, Michigan, United States, at the age of 80, and was buried in Millington Cemetery, Millington, Tuscola, Michigan, United States.