When Andrew Ellicott was born on 24 January 1754, in Solebury, Solebury Township, Bucks, Pennsylvania, United States, his father, Joseph Ellicott, was 21 and his mother, Judith Blaker, was 24. He married Sarah Brown in 1775. They were the parents of at least 5 sons and 6 daughters. He registered for military service in 1776. In 1813, at the age of 59, his occupation is listed as professor of mathematics in West Point, Highlands, Orange, New York, United States. He died on 23 August 1820, in West Point, Highlands, Orange, New York, United States, at the age of 66, and was buried in United States Military Academy Post Cemetery, West Point, Highlands, Orange, New York, United States.