Proctor Nichols was born on July 30, 1800, in Sturbridge, Massachusetts, to Edmund and Sally Nichols. He married Betsey Richardson there on March 24, 1827, and they had at least five children: Alpheus, born around 1835; Lucius, born around 1837; Sarah, born around 1840; Samuel, born around 1842; and Fayette, born around 1845. The family lived in Brookfield, Massachusetts, and Nichols worked as a farmer. By 1850, they owned $2,500 of real estate. A decade later, he owned $2,800 of real estate and $800 of personal property. He died in Brookfield on June 13, 1884.