Millom participated in the Lancashire Senior Competition and the Northern Rugby League until the end of the 1905–06 season at which time the club decided to leave the professional game and revert to an amateur team playing in the Cumberland Senior Competition.

The club's biggest honour came in the 1985-86 season, when they played against Mysons in the British Amateur Rugby League Association National Cup Final.

Later that year, the club gave Wakefield Trinity a scare, losing only 8-14 in the John Player Trophy.

They were National Conference League division one champions in 1994-1995, and won its challenge cup in 1990-1991.

In the 2007-08 season, the club finished as champions of the National Conference league division 2.