It is located southeast of Rivière-du-Loup and west of Cabano along the Trans-Canada Highway (Route 185), about halfway to Edmundston in New Brunswick.

The Commission de toponymie du Québec asserts that the parish's name refers to nearby Lake Témiscouata, the sense of haha here being an archaic French word for an impasse;[4] see Ha-ha.

is the only town in the world with two exclamation points in its name, and shares the distinction of having an exclamation point in its name with Westward Ho!, a village in Devon, in south-west England.

[5] In September 2017, the municipality established a Guinness World Record for the "Most exclamation marks in a town name".

[6] In the 2021 Census of Population conducted by Statistics Canada, Saint-Louis-du-Ha!