KMSR, known as 99 KMSR, is a family-owned radio station based in Mayville, North Dakota, broadcasting on 1520 AM and on the 98.9 FM translator K255DG. It airs local high school and college sports play-by-play, syndicated sports talk such as The Dan Patrick Show and The Herd, and classic hits. The station is licensed to Northwood, North Dakota, and serves the Red River Valley.
