In September 1758, the Virginia General Assembly appointed Martin as one of the trustees of Winchester. Martin was further appointed as a trustee of the town of Stephensburg (present-day Stephens City). His uncle Lord Fairfax, John Hite, Gabriel Jones, Robert Rutherford, Lewis Stephens, and James Wood were also appointed trustees of the towns alongside Martin. When the town of Bath (present-day Berkeley Springs) received its charter from the Virginia General Assembly in October 1776, Martin was appointed as a trustee alongside Bryan Fairfax, Philip Pendleton, Robert Rutherford, Samuel Washington, Warner Washington, Alexander White, and others.