Teams Billy Mackay played for

Other FCMinor Counties (1929)
Minor Counties ChampionshipNorthumberland (1920-1939)
MiscellaneousNorthumberland (1919-1943)
 Backworth (1924-1925)
 Northumberland Second XI (1926)
 County Club (1931-1945)
 Sir RGE Mortimer's XI (1944)