Lydia Bumpus was born on June 16, 1842, in Plympton, Massachusetts, to Cephus C. Bumpus and Amelia Foster. Her father was a shoemaker and station agent who owned $1,000 of real estate and $300 of personal property by 1860. She grew up and attended school in Plympton, and her family moved to Braintree, Massachusetts, sometime in the early 1850s.
She married James E. Johnson around 1865, and they had at least three children: Burton, born around 1866; Mabel, born around 1867; and Augustus, born around 1880. They lived in Braintree, and her husband worked in a boot factory. By 1870, they owned $1,000 of real estate and $300 of personal property. They moved to Weymouth, Massachusetts, in the 1870s, and James worked as a grocer there. They returned to Braintree sometime before 1900, and her husband died there on March 1, 1910. She passed away sometime after 1920.