431 (2016 population: 1,086) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

431 incorporated as a rural municipality on January 1, 1913.

In the 2021 Census of Population conducted by Statistics Canada, the RM of St. Louis No.

431 is governed by an elected municipal council and an appointed administrator that meets on the first Wednesday of every month.

[3] The reeve of the RM is Emile Boutin while its administrator is Sindy Tait.