[2] In 2020, it was announced that Northumberland was merging its team with Durham, becoming North East Warriors.

[7] Since then, Northumberland consistently played in the bottom tier of the Championship, with their best season coming in 2016, finishing 3rd in Division 4 N&E.

[8] In the Women's Twenty20 Cup, Northumberland performed similarly, playing in Divisions Three and Four.

[9] In 2010, they reached a Divisional Final to play for promotion, but lost to Northamptonshire.

[10] Northumberland did not compete in the 2019 tournament, but will return in 2021 as North East Warriors, a combined side with Durham.