The Johnstown District was a historic district in Upper Canada which existed until 1849.
Historical evolution
In 1798, the new Parliament of Upper Canada divided the territory of the Eastern District in two, which went into force in January 1800, and the following counties were withdrawn to form the Johnstown District:
the township of Nepean, with the tract of land to be hereafter laid out into townships, between Nepean and a line drawn north fifteen degrees from the north-west angle of the township of Crosby, until it intersects the Ottawa River, with such of the islands in the said river as are wholly, or in greater part opposite thereto
The District's territory was subsequently reduced in several steps:
In 1822, Carleton County was withdrawn and transferred to the new Bathurst District.[3]
In 1838, upon the creation of the new Dalhousie District, the township of North Gower and Marlborough were transferred to Carleton County, and the township of Montague, together with those portions of the townships of Elmsley and Burgess lying north of the Rideau River, were transferred to Lanark County.[4]