Teams Billy Mackay played for
| Other FC | Minor Counties (1929) |
| Minor Counties Championship | Northumberland (1920-1939) |
| Miscellaneous | Northumberland (1919-1943) |
| Backworth (1924-1925) | |
| Northumberland Second XI (1926) | |
| County Club (1931-1945) | |
| Sir RGE Mortimer's XI (1944) |
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