KMSR (1520 AM) is a radio station in Mayville, North Dakota, licensed to Northwood, serving the Red River Valley of eastern North Dakota and northwest Minnesota.
Formerly known as "Sports Radio 1520", KMSR rebranded as "99KMSR" upon launching an FM translator in late 2020.
KMSR covers the Red River Valley area, including Mayville, Grand Forks, and Fargo.
Simulcast for many years, KMAV-FM and KMSR (formerly KMAV) have been broadcasting separate programming since November 2003.
Five-time North Dakota Sportscaster of the Year, Dan Keating, calls basketball, baseball, football, volleyball, and softball.