[2] The 2018 Leeds—Grenville—Thousand Islands and Rideau Lakes federal by-election was won by Michael Barrett.

Ethnic groups: 91.3% White, 5.6% Indigenous Languages: 91.7% English, 3.2% French Religions: 60.6% Christian (22.2% Catholic, 11.5% United Church, 9.9% Anglican, 2.3% Presbyterian, 1.3% Methodist, 1.3% Pentecostal, 12.1% other), 37.7% none Median income: $41,600 (2020) Average income: $51,040 (2020) The federal district was created in 1976 from parts of Grenville–Carleton and Leeds ridings.

The 2003 redistribution defined the riding as also including the independent municipalities of Brockville, Gananoque and Prescott which are politically separate jurisdictions, but are geographically within the county, and therefore did not result in a boundary change either.

With the 2012 electoral redistribution, this district lost a small portion of territory to Lanark—Frontenac—Kingston,[5] following an annexation of a parcel of land by the Town Smiths Falls.

Following the 2022 Canadian federal electoral redistribution, this riding will be renamed Leeds—Grenville—Thousand Islands—Rideau Lakes at the first election held after approximately April 2024.