The town was chartered in 1672 as part of the Massachusetts Grant. In 1736 the area was granted by Massachusetts as part of Fall Town, and in 1753 the area was granted as Hinsdale. When the Connecticut River was established as a boundary, two separate towns were created: Hinsdale, New Hampshire and Hinsdale, Vermont. The people who lived in Hinsdale, Vermont wanted a separate name, and in 1802 the Vermont legislature changed the town's name to Vernon. The name is said to have been chosen after President George Washington's plantation home, Mount Vernon. Fort Bridgman, in Vernon, was burned in 1755, a casualty of the French and Indian War.
(Info from wikipedia)