Va. Code Ann. § 17.1-103

Each judge of a circuit court shall, during his term of office, reside within the circuit to which he was appointed or elected and his removal therefrom shall vacate his office. Where the boundary of the jurisdiction of a court is changed by annexation or otherwise, a judge thereof shall not become disqualified from office or ineligible for reelection if, except for such annexation or change, he would otherwise be qualified.