United Counties of Leeds and Grenville

Leeds Grenville
United Counties of Leeds and Grenville
Location of Leeds and Grenville United Counties
Coordinates: 44°50′N 75°40′W / 44.833°N 75.667°W / 44.833; -75.667
CountryCanada
ProvinceOntario
RegionEastern Ontario
Formed1 January 1850
County seatBrockville
Municipalities
List
Area
  Land3,322.75 km2 (1,282.92 sq mi)
  Census division3,355.61 km2 (1,295.61 sq mi)
 Land area excludes Brockville, Gananoque, and Prescott
Population
 (2021)
  Total
72,493
  Density21.8/km2 (56/sq mi)
  Census division
104,070
  Census division density31.0/km2 (80/sq mi)
 Total excludes Brockville, Gananoque, and Prescott
Time zoneUTC−05:00 (EST)
  Summer (DST)UTC−04:00 (EDT)
Websitewww.leedsandgrenville.ca

The United Counties of Leeds and Grenville, commonly known as Leeds and Grenville, is a county and census division in Ontario, Canada, in the Eastern Ontario subregion of Southern Ontario. It fronts on the St. Lawrence River and the international boundary between Canada and the United States, opposite of the State of New York. The county seat is Brockville. The county was formed by the union of the historical counties of Leeds and Grenville in 1850.