United Counties of Northumberland and Durham, Ontario

United Counties of Northumberland and Durham
Dissolved county
Excerpt map from the 1878 publication titled The Illustrated historical atlas of the counties of Northumberland and Durham, Ontario, Canada
CountryCanada
ProvinceOntario
Established1850 (merger of Durham and Northumberland County)
Dissolved1977 officially (1974 legislated split into Northumberland County and the Regional Municipality of Durham)

The United Counties of Northumberland and Durham was a historic county in the Canadian province of Ontario.[1] The two counties were originally combined into the District of Newcastle, formed in 1802, and continued as united counties from 1850 until January 1, 1974. At the time, portions of Durham County were amalgamated with adjacent Ontario County to form the Regional Municipality of Durham. Manvers Township went to Victoria County and what is now Cavan Monaghan went to Peterborough County. What is now Port Hope remained in the area which continued as Northumberland County, while Durham County was restructured into Durham Region.


  1. ^ "United Counties of Northumberland and Durham - Trent University Archives". archives.trentu.ca. Retrieved 2026-03-12.
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