United Counties of Leeds and Grenville

Leeds Grenville
County (upper-tier)
United Counties of Leeds and Grenville
Seal
Location of Leeds and Grenville United Counties
Coordinates: 44°50′N 75°40′W / 44.833°N 75.667°W / 44.833; -75.667
Country	Canada
Province	Ontario
Region	Eastern Ontario
Formed	1 January 1850
County seat	Brockville
Municipalities	List Township of Athens Township of Augusta Township of Edwardsburgh/Cardinal Township of Elizabethtown-Kitley Township of Front of Yonge Township of Leeds and the Thousand Islands Municipality (township) of North Grenville Township of Rideau Lakes Village of Merrickville-Wolford Village of Westport
Area [1]
• Land	3,322.75 km2 (1,282.92 sq mi)
• Census division	3,355.61 km2 (1,295.61 sq mi)
	Land area excludes Brockville, Gananoque, and Prescott
Population  (2021)[1]
• Total	72,493
• Density	21.8/km2 (56/sq mi)
• Census division	104,070
• Census division density	31.0/km2 (80/sq mi)
	Total excludes Brockville, Gananoque, and Prescott
Time zone	UTC−05:00 (EST)
• Summer (DST)	UTC−04:00 (EDT)
Website	www.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.