Carleton County, Ontario

Carleton County is the name of a historic county in Ontario, Canada. In 1969, it was superseded by the Regional Municipality of Ottawa-Carleton. In 2001, the Regional Municipality and the eleven local municipalities within it were replaced by the current City of Ottawa.

Carleton County was created in 1800 from portions of Dundas and Grenville counties. It was named after Guy Carleton, 1st Baron Dorchester. Early Carleton County included a vague area of Eastern Ontario that included most of what is now Lanark County plus the area of what is now Ottawa west of the Rideau River. Originally part of Johnstown District for administrative purposes, it became part of Bathurst District, with judicial seat at Perth in 1823. In 1838, a separate Dalhousie District, with judicial seat at Bytown, was created with the same boundaries as Carleton County had in 1969 when it was abolished. In 1850, the Districts in Ontario were re-distributed into Counties by the Municipal Corporations Act and the administrative district of Dalhousie was replaced by Carleton County.

In 1850, Carleton County included the following townships (from northwest to southeast):

Carleton County and today's city of Ottawa have the same borders; except that when Ottawa-Carleton came into existence, it added the Township of Cumberland from Russell County.

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