19 famous people were born in Yamachiche, more of them leaders than in most towns

By our measure the best known is Aram J. Pothier (American politician); the spotlight above gives the details. Next come Antoine Gérin-Lajoie and Sévère Rivard.

Wikidata counts 23 born here, but only those an article confirms are listed.

Across Canadian towns the figure is 22%; here, 79%.

Augustin Rivard, born in 1743. The youngest on the list was born in 1880.

Two sources must agree: Wikidata, placing the birth inside Yamachiche’s municipal boundary (Statistics Canada’s 2021 census subdivision) or one of its hospitals or districts, and the person’s English or French Wikipedia article. Moving here later is not enough, and adult performers and people known chiefly for crimes are not listed.

The likeliest reasons: a birthplace recorded only as a province or as Canada, a hamlet or rural area with no page of its own, or an article that gives another place or none. Fixing Wikidata or Wikipedia brings them onto the list at the next refresh, as long as the two then agree.