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The area was originally part of the Mitis seignory, purchased by Mathew MacNider in 1802, and acquired by his brother John MacNider in 1807. MacNider encouraged settlement of Scottish families there. Upon John Macnider's death in 1829, the seignory was inherited by the 2 sons of Adam Lymburner Macnider, nephew of John. In 1842, the geographic township of MacNider was created.
In 1853, the Mission of L'Assomption-de-Notre-Dame was established, and in 1859, the Township Municipality of MacNider was formed when it ceded from the Municipality of Métis. In 1864, the MacNider Post Office opened.
The Scottish settlers began to call the place Sandy Bay, or also Sandy Beach, in reference to a prominent sandbank on the western edge of the municipality. In 1902, the post office was renamed to Sandy Bay, and renamed to the French equivalent, Baie-des-Sables, in 1925. In 1932, the township municipality followed suit and changed name and statutes from Township Municipality of MacNider to the Municipality of Baie-des-Sables.
"1971 Census of Canada - Population Census Subdivisions (Historical)". Catalogue 92-702 Vol I, Part 1 (Bulletin 1.1-2). Statistics Canada: 76, 139. July 1973.