2021 Main
| Pl | W | D | L | Diff | Pts | |||
| 1 | Perth SC | 22 | 14 | 6 | 2 | 37:18 | 19 | 48 |
| 2 | Floreat Athena | 22 | 13 | 5 | 4 | 48:26 | 22 | 44 |
| 3 | Sorrento | 22 | 12 | 6 | 4 | 41:27 | 14 | 42 |
| 4 | Perth Glory U21 | 22 | 10 | 7 | 5 | 42:25 | 17 | 37 |
| 5 | Inglewood Utd | 22 | 10 | 4 | 8 | 48:41 | 7 | 34 |
| 6 | Perth RedStar | 22 | 10 | 2 | 10 | 37:34 | 3 | 32 |
| 7 | Armadale | 22 | 7 | 6 | 9 | 36:44 | -8 | 27 |
| 8 | Bayswater | 22 | 8 | 3 | 11 | 39:49 | -10 | 27 |
| 9 | Cockburn City | 22 | 6 | 5 | 11 | 27:36 | -9 | 23 |
| 10 | Gwelup Croatia SC | 22 | 3 | 10 | 9 | 34:43 | -9 | 19 |
| 11 | Balcatta | 22 | 4 | 7 | 11 | 28:44 | -16 | 19 |
| 12 | Rockingham City | 22 | 4 | 1 | 17 | 18:48 | -30 | 13 |
Promotion ~ NPL ACT (Final Stage: )
Promotion ~ NPL Western Australia (Play Offs: )
Relegation
2021 Play Offs
Quarter-finals
| 1 | Perth SC | Floreat Athena | 4 : 0 |
| 4 | Sorrento | Perth Glory U21 | 1 : 3 |
Semi-finals
| 1 | Perth SC | Bye | |
| 2 | Floreat Athena | Perth Glory U21 | 2 : 1 |
Final
| 1 | Perth SC | Floreat Athena | 6 : 3 |
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