Like many towns in New Hampshire, New London's borders underwent several adjustments as pockets of settlement petitioned to join with nearby New London. In 1807, nearly half of New London's original grant was separated when the town of Wilmot was formed. For this reason, New London today has a much smaller land area than most of its neighbors. The township lines first drawn on a Masonian Proprietor's map in Portsmouth often proved impractical once the actual topography of the region became known.
