Isthmian League Tables
1988/89 Tables◄ 1989/90 Tables ►1990/91 Tables
Isthmian League Premier Division 1989/90
| Pos | Club | Pld | W | D | L | F | A | GD | Pts | Notes |
| 1st | Slough Town | 42 | 27 | 11 | 4 | 85 | 38 | +47 | 92 | ▲Champions |
| 2nd | Wokingham Town | 42 | 26 | 11 | 5 | 67 | 34 | +33 | 89 | Runners Up |
| 3rd | Aylesbury United | 42 | 25 | 9 | 8 | 86 | 30 | +56 | 84 | - |
| 4th | Kingstonian | 42 | 24 | 9 | 9 | 87 | 51 | +36 | 81 | - |
| 5th | Grays Athletic | 42 | 19 | 13 | 10 | 59 | 44 | +15 | 70 | - |
| 6th | Dagenham | 42 | 17 | 15 | 10 | 54 | 43 | +11 | 66 | - |
| 7th | Leyton-Wingate | 42 | 20 | 6 | 16 | 54 | 48 | +6 | 66 | - |
| 8th | Basingstoke Town | 42 | 18 | 9 | 15 | 65 | 55 | +10 | 63 | - |
| 9th | Bishop's Stortford | 42 | 19 | 6 | 17 | 60 | 59 | +1 | 63 | - |
| 10th | Carshalton Athletic | 42 | 19 | 5 | 18 | 63 | 59 | +4 | 59* | - |
| 11th | Redbridge Forest | 42 | 16 | 11 | 15 | 65 | 62 | +3 | 59 | - |
| 12th | Hendon | 42 | 15 | 10 | 17 | 54 | 63 | -9 | 55 | - |
| 13th | Windsor & Eton | 42 | 13 | 15 | 14 | 51 | 47 | +4 | 54 | - |
| 14th | Hayes | 42 | 14 | 11 | 17 | 61 | 59 | +2 | 53 | - |
| 15th | St Albans City | 42 | 13 | 10 | 19 | 49 | 59 | -10 | 49 | - |
| 16th | Staines Town | 42 | 14 | 6 | 22 | 53 | 69 | -16 | 48 | - |
| 17th | Marlow | 42 | 11 | 13 | 18 | 42 | 59 | -17 | 46 | - |
| 18th | Harrow Borough | 42 | 11 | 10 | 21 | 51 | 79 | -28 | 43 | - |
| 19th | Bognor Regis Town | 42 | 9 | 14 | 19 | 37 | 67 | -30 | 41 | - |
| 20th | Barking | 42 | 7 | 11 | 24 | 53 | 86 | -33 | 32 | - |
| 21st | Bromley | 42 | 7 | 11 | 24 | 32 | 69 | -37 | 32 | ▼Relegated |
| 22nd | Dulwich Hamlet | 42 | 6 | 8 | 28 | 32 | 80 | -48 | 26 | ▼Relegated |
* Carshalton Athletic were Deducted 3 Points
Isthmian League Division 1 1989/90
| Pos | Club | Pld | W | D | L | F | A | GD | Pts | Notes |
| 1st | Wivenhoe Town | 42 | 31 | 7 | 4 | 94 | 36 | +58 | 100 | ▲Champions |
| 2nd | Woking | 42 | 30 | 8 | 4 | 102 | 29 | +73 | 98 | ▲Runners Up |
| 3rd | Southwick | 42 | 23 | 15 | 4 | 68 | 30 | +38 | 84 | - |
| 4th | Hitchin Town | 42 | 22 | 13 | 7 | 60 | 30 | +30 | 79 | - |
| 5th | Walton & Hersham | 42 | 20 | 10 | 12 | 68 | 50 | +18 | 70 | - |
| 6th | Dorking | 42 | 19 | 12 | 11 | 66 | 41 | +25 | 69 | - |
| 7th | Boreham Wood | 42 | 17 | 13 | 12 | 60 | 59 | +1 | 64 | - |
| 8th | Harlow Town | 42 | 16 | 13 | 13 | 60 | 53 | +7 | 61 | - |
| 9th | Metropolitan Police | 42 | 16 | 11 | 15 | 54 | 59 | -5 | 59 | - |
| 10th | Chesham United | 42 | 15 | 12 | 15 | 46 | 49 | -3 | 57 | - |
| 11th | Chalfont St Peter | 42 | 14 | 13 | 15 | 50 | 59 | -9 | 55 | - |
| 12th | Tooting & Mitcham United | 42 | 14 | 13 | 15 | 42 | 51 | -9 | 55 | - |
| 13th | Worthing | 42 | 15 | 8 | 19 | 56 | 63 | -7 | 53 | - |
| 14th | Whyteleafe | 42 | 11 | 16 | 15 | 50 | 65 | -15 | 49 | - |
| 15th | Lewes | 42 | 12 | 11 | 19 | 55 | 65 | -10 | 47 | - |
| 16th | Wembley | 42 | 11 | 10 | 21 | 57 | 68 | -11 | 43 | - |
| 17th | Croydon | 42 | 9 | 16 | 17 | 43 | 57 | -14 | 43 | - |
| 18th | Uxbridge | 42 | 11 | 10 | 21 | 52 | 75 | -23 | 43 | - |
| 19th | Hampton | 42 | 8 | 13 | 21 | 28 | 51 | -23 | 37 | ▼Div 2 South |
| 20th | Leatherhead | 42 | 7 | 10 | 25 | 34 | 77 | -43 | 31 | ▼Div 2 South |
| 21st | Purfleet | 42 | 7 | 8 | 27 | 33 | 78 | -45 | 29 | ▼Div 2 North |
| 22nd | Kingsbury Town | 42 | 8 | 10 | 24 | 45 | 78 | -33 | 25* | ▼Div 2 North |
* Kingsbury Town were Deducted 9 Points
Isthmian League Division 2 North 1989/90
| Pos | Club | Pld | W | D | L | F | A | GD | Pts | Notes |
| 1st | Heybridge Swifts | 42 | 26 | 9 | 7 | 79 | 29 | +50 | 87 | ▲Champions |
| 2nd | Aveley | 42 | 23 | 16 | 3 | 68 | 24 | +44 | 85 | ▲Runners Up |
| 3rd | Hertford Town | 42 | 24 | 11 | 7 | 92 | 51 | +41 | 83 | - |
| 4th | Stevenage Borough | 42 | 21 | 16 | 5 | 70 | 31 | +39 | 79 | - |
| 5th | Barton Rovers | 42 | 22 | 6 | 14 | 60 | 45 | +15 | 72 | - |
| 6th | Tilbury | 42 | 20 | 9 | 13 | 68 | 54 | +14 | 69 | - |
| 7th | Basildon United | 42 | 13 | 20 | 9 | 50 | 44 | +6 | 59 | - |
| 8th | Collier Row | 42 | 15 | 13 | 14 | 43 | 45 | -2 | 58 | - |
| 9th | Royston Town | 42 | 15 | 11 | 16 | 63 | 72 | -9 | 56 | - |
| 10th | Saffron Walden Town | 42 | 15 | 11 | 16 | 60 | 73 | -13 | 56 | - |
| 11th | Vauxhall Motors (Luton) | 42 | 14 | 13 | 15 | 55 | 54 | +1 | 55 | - |
| 12th | Clapton | 42 | 13 | 16 | 13 | 50 | 46 | +4 | 54* | - |
| 13th | Ware | 42 | 14 | 11 | 17 | 53 | 59 | -6 | 53 | - |
| 14th | Hemel Hempstead | 42 | 12 | 15 | 15 | 58 | 70 | -12 | 51 | - |
| 15th | Billericay Town | 42 | 13 | 11 | 18 | 49 | 58 | -9 | 50 | - |
| 16th | Hornchurch | 42 | 12 | 12 | 18 | 49 | 64 | -15 | 48 | - |
| 17th | Berkhamsted Town | 42 | 9 | 16 | 17 | 44 | 68 | -24 | 43 | - |
| 18th | Finchley | 42 | 11 | 10 | 21 | 50 | 75 | -25 | 43 | - |
| 19th | Tring Town | 42 | 10 | 9 | 23 | 48 | 70 | -22 | 39 | - |
| 20th | Witham Town | 42 | 8 | 14 | 20 | 44 | 56 | -12 | 38 | - |
| 21st | Rainham Town | 42 | 9 | 11 | 22 | 48 | 75 | -27 | 38 | - |
| 22nd | Letchworth Garden City | 42 | 7 | 12 | 23 | 30 | 68 | -38 | 33 | ▼Relegated |
* Clapton were Deducted 1 Point
Isthmian League Division 2 South 1989/90
| Pos | Club | Pld | W | D | L | F | A | GD | Pts | Notes |
| 1st | Yeading | 40 | 29 | 4 | 7 | 86 | 37 | +49 | 91 | ▲Champions |
| 2nd | Molesey | 40 | 24 | 11 | 5 | 76 | 30 | +46 | 83 | ▲Runners Up |
| 3rd | Abingdon Town | 40 | 22 | 9 | 9 | 64 | 39 | +25 | 75 | - |
| 4th | Ruislip Manor | 40 | 20 | 12 | 8 | 60 | 32 | +28 | 72 | - |
| 5th | Maidenhead United | 40 | 20 | 12 | 8 | 66 | 39 | +27 | 72 | - |
| 6th | Southall | 40 | 22 | 5 | 13 | 56 | 33 | +23 | 71 | - |
| 7th | Newbury Town | 40 | 21 | 7 | 12 | 50 | 38 | +14 | 70 | - |
| 8th | Flackwell Heath | 40 | 16 | 11 | 13 | 69 | 65 | +4 | 59 | - |
| 9th | Hungerford Town | 40 | 14 | 16 | 10 | 54 | 51 | +3 | 58 | - |
| 10th | Egham Town | 40 | 12 | 14 | 14 | 39 | 38 | +1 | 50 | - |
| 11th | Banstead Athletic | 40 | 14 | 8 | 18 | 46 | 47 | -1 | 50 | - |
| 12th | Harefield United | 40 | 13 | 9 | 18 | 44 | 46 | -2 | 48 | - |
| 13th | Chertsey Town | 40 | 13 | 9 | 18 | 53 | 58 | -5 | 48 | - |
| 14th | Epsom & Ewell | 40 | 13 | 9 | 18 | 49 | 54 | -5 | 48 | - |
| 15th | Malden Vale | 40 | 13 | 7 | 20 | 36 | 67 | -31 | 46 | - |
| 16th | Eastbourne United | 40 | 11 | 10 | 19 | 47 | 65 | -18 | 43 | - |
| 17th | Camberley Town | 40 | 11 | 9 | 20 | 44 | 66 | -22 | 42 | - |
| 18th | Feltham | 40 | 11 | 7 | 22 | 47 | 80 | -33 | 40 | - |
| 19th | Bracknell Town | 40 | 10 | 9 | 21 | 40 | 57 | -17 | 39 | - |
| 20th | Petersfield United | 40 | 10 | 8 | 22 | 48 | 93 | -45 | 38 | - |
| 21st | Horsham | 40 | 4 | 8 | 28 | 29 | 70 | -41 | 20 | - |
Isthmian League - End of Season Notes
|
Teams Leaving the Isthmian League |
| ▲Slough Town were Promoted to the 1990/91 Football Conference |
| ▼Letchworth Garden City were Relegated to the South Midlands League |
-
|
Teams Joining the Isthmian League |
| ▼Enfield were Relegated from the 1989/90 Football Conference |
| ▲Cove Joined from the Combined Counties League |
| ▲Edgware Town Joined from the Spartan League |
1988/89 Tables◄ 1989/90 Tables ►1990/91 Tables