In addition to his management of the proprietary, Martin began taking an active role in political and civil affairs within his uncle's domain. Following an act of the Virginia General Assembly in February 1752, the Anglican Frederick Parish was authorized to hold an election for twelve parish
vestrymen before June 15 of that year. Martin was elected as a vestryman, alongside his uncle Lord Fairfax and
Gabriel Jones. Martin and his fellow vestrymen set about expanding and enlarging the Anglican presence within the parish. Under the act establishing the county, the first county court was to have been held in June 1754; however, the first court was not held until December 1757. The first court to be held was, in addition to Martin, composed of justices James Simpson, William Miller, Solomon Hedges, and Nathaniel Kuykendall with Gabriel Jones serving as the Clerk of Court. In 1758, Martin and
George Washington challenged the incumbents and ran for election to represent
Frederick County in the House of Burgesses against Hugh West and Thomas Swearingen. Martin and Washington received considerable support from Lord Fairfax, and the leading Anglican cleric in Frederick County, William Meldrum. Washington received the most votes with 310, followed by Martin with 240 votes, 199 votes for West, and 45 votes for Swearingen. Martin chose not to run for reelection and retired from legislative politics in 1761. 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. Martin was also appointed as the colonel of the Frederick County militia. While Martin was not in the best of health, he could be relied upon by the settlers of the proprietary to use his considerable resources to act promptly during an emergency, especially in response to attacks by Native Americans. By the outbreak of the American Revolution, Martin was serving as an appointed justice on the Commission of Peace for Frederick County. Martin was reappointed as a justice of the peace by Governor
Patrick Henry, along with William Booth and Warner Washington, but all three men declined to serve another term. Martin did not swear into the committee because he refused to serve under the new revolutionary regime, initially believing that American independence from Great Britain was a futile effort. The committee had also been actively arresting
Loyalists, which may have influenced Martin's decision to turn down his reappointment. Martin retreated from performing civil service entirely, and afterward retired to Greenway Court. Prior to his death, Martin became an active
Freemason. == American Revolution and Lord Fairfax's death ==