The duo's respective contracts are due to expire next month and neither will be offered a new deal by the Yorkshire outfit.
Defender Overson, 19, has never featured for the Bantams' first team.
Meanwhile, 26-year-old centre-back Williams made 78 appearances for the Valley Parade club.
However, Williams's last game came back in November 2011.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Walsall | 24 | 17 | 4 | 3 | 48 | 21 | 27 | 55 |
| 2 | Crewe AlexandraCrewe | 25 | 11 | 10 | 4 | 33 | 22 | 11 | 43 |
| 3 | Doncaster RoversDoncaster | 26 | 12 | 7 | 7 | 36 | 30 | 6 | 43 |
| 4 | Salford City | 24 | 12 | 6 | 6 | 29 | 19 | 10 | 42 |
| 5 | Bradford CityBradford | 25 | 11 | 8 | 6 | 34 | 27 | 7 | 41 |
| 6 | Port Vale | 25 | 11 | 8 | 6 | 29 | 25 | 4 | 41 |
| 7 | AFC Wimbledon | 23 | 12 | 4 | 7 | 35 | 19 | 16 | 40 |
| 8 | Notts County | 24 | 11 | 7 | 6 | 38 | 26 | 12 | 40 |
| 9 | Grimsby Town | 25 | 12 | 1 | 12 | 36 | 40 | -4 | 37 |
| 10 | Chesterfield | 24 | 9 | 7 | 8 | 38 | 29 | 9 | 34 |
| 11 | MK Dons | 23 | 10 | 4 | 9 | 36 | 31 | 5 | 34 |
| 12 | Bromley | 24 | 8 | 10 | 6 | 35 | 30 | 5 | 34 |
| 13 | Cheltenham TownCheltenham | 25 | 8 | 7 | 10 | 34 | 38 | -4 | 31 |
| 14 | Gillingham | 24 | 9 | 3 | 12 | 22 | 25 | -3 | 30 |
| 15 | BarrowBarrow | 24 | 7 | 7 | 10 | 23 | 26 | -3 | 28 |
| 16 | Harrogate TownHarrogate | 26 | 8 | 4 | 14 | 23 | 37 | -14 | 28 |
| 17 | Fleetwood TownFleetwood | 22 | 6 | 9 | 7 | 28 | 28 | 0 | 27 |
| 18 | Colchester UnitedColchester | 24 | 5 | 12 | 7 | 28 | 28 | 0 | 27 |
| 19 | Newport CountyNewport | 23 | 7 | 5 | 11 | 30 | 40 | -10 | 26 |
| 20 | Accrington StanleyAccrington | 23 | 6 | 7 | 10 | 32 | 40 | -8 | 25 |
| 21 | Swindon TownSwindon | 26 | 5 | 10 | 11 | 31 | 41 | -10 | 25 |
| 22 | Tranmere RoversTranmere | 24 | 6 | 7 | 11 | 18 | 37 | -19 | 25 |
| 23 | Morecambe | 24 | 5 | 5 | 14 | 22 | 39 | -17 | 20 |
| 24 | Carlisle UnitedCarlisle | 25 | 4 | 6 | 15 | 19 | 39 | -20 | 18 |
| > League Two Full Table | |||||||||
