409 (2016 population: 506) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

409 incorporated as a rural municipality on December 13, 1909.

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

409 is governed by an elected municipal council and an appointed administrator that meets on the second Monday of every month.

[3] The reeve of the RM is Leslie Kroschinski while its administrator is Sherry Huber.