Andrew Ellicott’s family emigrated from Wales to what is now Bucks County in Pennsylvania in 1731. They had to leave Wales because Ann Bye Ellicott was a Quaker and when she married Ellicott (a non-Quaker), they were disowned and needed to start anew.

Andrew Ellicott was the first of nine children born to Joseph and Judith. The family continued the Quaker faith, finding welcome in a state founded by a Quaker, William Penn. Joseph supported the growing family by working as a miller and clockmaker. The children were educated at the local Quaker school, where Andrew’s talent for math and mechanics was encouraged and developed.