It was formed in 1802 from the Home District, consisting of the counties of Durham and Northumberland.
The legislature had enacted in 1798 that "as soon as there are one thousand souls within the said counties, and that six of the townships therein do hold town meetings according to law," the government shall constitute them as a separate district;[1] which was done in 1802.
[2] The townships of together with the peninsula of Newcastle The townships of with all the tract of land ... which lies to the southward of the small lakes above the Rice Lake, and the communication between them and the communication between the eastern boundary of the township of Hope, and the western boundary of the township of Darlington, produced north fifteen degrees west, until they intersect either of the said lakes, or the communication between them...
The district town was originally Newcastle, located near the current town of Brighton, and then Amherst, later renamed Cobourg.
[4] It consisted of the following territory: The townships of and In 1850, the district was dissolved, and replaced with the United Counties of Northumberland and Durham that was established for municipal purposes.