Isthmian League
Premier Division 2017/18
| Pos | Club | Pld | W | D | L | F | A | GD | Pts | Notes |
| 1st | Billericay Town | 46 | 30 | 9 | 7 | 110 | 50 | +60 | 99 | ▲Champions |
| 2nd | Dulwich Hamlet | 46 | 28 | 11 | 7 | 91 | 41 | +50 | 95 | ♦▲PO Winners |
| 3rd | Hendon | 46 | 25 | 10 | 11 | 96 | 59 | +37 | 85 | ♦Playoffs/Transferred |
| 4th | Folkestone Invicta | 46 | 25 | 10 | 11 | 104 | 71 | +33 | 85 | ♦Playoffs |
| 5th | Leiston | 46 | 23 | 10 | 13 | 82 | 53 | +29 | 79 | ♦Playoffs/Transferred |
| 6th | Leatherhead | 46 | 24 | 7 | 15 | 68 | 49 | +19 | 79 | - |
| 7th | Margate | 46 | 20 | 17 | 9 | 77 | 53 | +24 | 77 | - |
| 8th | Staines Town | 46 | 21 | 12 | 13 | 106 | 83 | +23 | 75 | Transferred |
| 9th | Wingate & Finchley | 46 | 20 | 9 | 17 | 63 | 71 | -8 | 69 | - |
| 10th | Metropolitan Police | 46 | 19 | 12 | 15 | 76 | 71 | +5 | 66* | Transferred |
| 11th | Tonbridge Angels | 46 | 19 | 7 | 20 | 58 | 63 | -5 | 64 | - |
| 12th | Harrow Borough | 46 | 19 | 6 | 21 | 69 | 76 | -7 | 63 | Transferred |
| 13th | Kingstonian | 46 | 18 | 5 | 23 | 57 | 70 | -13 | 59 |
- |
| 14th | Dorking Wanderers | 46 | 16 | 10 | 20 | 77 | 80 | -3 | 58 |
- |
| 15th | Thurrock | 46 | 17 | 6 | 23 | 68 | 79 | -11 | 57 |
▼Folded |
| 16th | Worthing | 46 | 15 | 12 | 19 | 71 | 84 | -13 | 57 |
- |
| 17th | Enfield Town | 46 | 14 | 14 | 18 | 72 | 80 | -8 | 56 |
- |
| 18th | Merstham | 46 | 15 | 11 | 20 | 69 | 80 | -11 | 56 |
- |
| 19th | Needham Market | 46 | 13 | 10 | 23 | 65 | 84 | -19 | 49 | Transferred |
| 20th | Brightlingsea Regent | 46 | 13 | 9 | 24 | 67 | 89 | -22 | 48 | - |
| 21st | Harlow Town | 46 | 13 | 8 | 25 | 55 | 88 | -33 | 47 | - |
| 22nd | Lowestoft Town | 46 | 12 | 7 | 27 | 52 | 92 | -40 | 43 |
Transferred |
| 23rd | Burgess Hill Town | 46 | 9 | 9 | 28 | 64 | 102 | -38 | 36 | - |
| 24th | Tooting & Mitcham United | 46 | 9 | 9 | 28 | 52 | 101 | -49 | 36 | ▼Relegated |
|
Isthmian League Premier Division Playoffs |
|||
| Date | Home | Score | Away |
|
Semi Finals |
|||
| 03/05/2018 | Dulwich Hamlet | 1-0 | Leiston |
| 03/05/2018 | Hendon | 4-0 | Folkestone Invicta |
|
Final |
|||
| 07/05/2018 | Dulwich Hamlet | 1-1 | Hendon |
| Dulwich Hamlet Won 4-3 on Penalties | |||
|
End of Season Notes |
| *Metropolitan Police were Deducted 3 Points for fielding an ineligible player |
| ▼Whitehawk were Relegated from the National League South |
| ▼Bognor Regis Town were Relegated from the National League South |
| ▲Billericay Town were Promoted to the National League South |
| ♦Dulwich Hamlet Qualified for the Playoffs |
| ♦Hendon Qualified for the Playoffs |
| ♦Folkestone Invicta Qualified for the Playoffs |
| ♦Leiston Qualified for the Playoffs |
| ♦▲Dulwich Hamlet were Promoted to the National League South via the Playoffs |
| ►Harrow Borough Transferred to the Southern Football League South Division |
| ►Hendon Transferred to the Southern Football League South Division |
| ►Leiston Transferred to the Southern Football League Central Division |
| ►Lowestoft Town Transferred to the Southern Football League Central Division |
| ►Metropolitan Police Transferred to the Southern Football League South Division |
| ►Needham Market Transferred to the Southern Football League Central Division |
| ►Staines Town Transferred to the Southern Football League South Division |
| ▼Thurrock Resigned from the League and Folded |
| ▼Tooting & Mitcham United were Relegated to the Southern League League East Division |
| ►Bishop's Stortford Transferred from the Southern Football League Premier Division |
| ▲AFC Hornchurch were Promoted from the Isthmian League North Division |
| ▲Potters Bar Town were Promoted from the Isthmian League North Division |
| ♦▲Haringey Borough were Promoted from the Isthmian League North Division via the Playoffs |
| ▲Carshalton Athletic were Promoted from the Isthmian League South Division |
| ▲Lewes were Promoted from the Isthmian League South Division |
| ♦▲Corinthian Casuals were Promoted from the Isthmian League South Division as the highest Level 8 Playoff final loser with the highest Points Per Game following Thurrock's resignation |