In 1714, all of the unincorporated territory north of the towns of Coventry and Windham in northeastern Connecticut to the Massachusetts border were placed under the jurisdiction of Hartford County. Windham County was constituted in 1726, resulting in Hartford County losing the towns of Windham, Coventry, Mansfield (incorporated in 1702), and Ashford (incorporated in 1714). Northwestern Connecticut, which was originally placed under the jurisdiction of New Haven County in 1722, was transferred to Hartford County by 1738. All of northwestern Connecticut was later constituted as the new Litchfield County in 1751. In 1785, two more counties were established in what was now the U.S. state of Connecticut: Tolland and Middlesex. This mostly resulted in the modern extent of Hartford County. In the late 18th and early 19th centuries, the establishment of several more towns resulted in minor adjustments in the bounds of the county. The final adjustment resulting in the modern limits occurred on May 8, 1806, when the town of Canton was established.