| 1. | 2023-24 | League One | 4,836 |
| 2. | 2025-26 | League One | 4,237 |
| 3. | 2026-27 | League One | 4,219 |
| 4. | 2024-25 | League One | 4,005 |
| 5. | 2022-23 | League Two | 3,691 |
| 6. | 2011-12 | League One | 3,559 |
| 7. | 2015-16 | League Two | 3,349 |
| 8. | 2014-15 | League Two | 3,171 |
| 9. | 2012-13 | League One | 3,170 |
| 10. | 2013-14 | League One | 2,964 |
| 11. | 2019-20 | League Two | 2,906 |
| 12. | 2010-11 | League Two | 2,900 |
| 13. | 2016-17 | League Two | 2,899 |
| 14. | 2021-22 | League Two | 2,894 |
| 15. | 1996-97 | Conference | 2,881 |
| 16. | 2018-19 | League Two | 2,715 |
| 17. | 2009-10 | Conference | 2,630 |
| 18. | 2017-18 | League Two | 2,610 |
| 19. | 1998-99 | Conference | 2,559 |
| 20. | 1997-98 | Conference | 2,252 |
| 21. | 2007-08 | Conference | 2,225 |
| 22. | 2005-06 | Conference | 2,178 |
| 23. | 1999-00 | Conference | 2,169 |
| 24. | 2006-07 | Conference | 2,102 |
| 25. | 2004-05 | Conference | 2,095 |
| 26. | 2003-04 | Conference | 2,002 |
| 27. | 2008-09 | Conference | 1,989 |
| 28. | 2002-03 | Conference | 1,898 |
| 29. | 1995-96 | Conference | 1,897 |
| 30. | 2000-01 | Conference | 1,814 |
| 31. | 2001-02 | Conference | 1,716 |
| 32. | 2020-21 | League Two | 1,500 |
| 33. | 1967-68 | Southern League Premier Division | 1,438 |
| 34. | 1994-95 | Conference | 1,412 |
| 35. | 1966-67 | Southern League Division One | 1,365 |
| 36. | 1964-65 | Southern League Division One | 1,264 |
| 37. | 1965-66 | Southern League Division One | 1,127 |
| 38. | 1969-70 | Metropolitan League | 1,093 |
| 39. | 1993-94 | Isthmian League Premier Division | 1,062 |
| 40. | 1968-69 | Metropolitan League | 1,053 |
| 41. | 1963-64 | Southern League Division One | 992 |
| 42. | 1970-71 | Southern League Division One | 755 |
| 43. | 1954-55 | Delphian League | 750 |
| 44. | 1991-92 | Isthmian League Division One | 643 |
| 45. | 1992-93 | Isthmian League Premier Division | 634 |
| 46. | 1961-62 | Delphian League | 600 |
| 47. | 1972-73 | Southern League Division One North | 596 |
| 48. | 1974-75 | Southern League Division One North | 542 |
| 49. | 1973-74 | Southern League Division One North | 526 |
| 50. | 1980-81 | United Counties League Division One | 506 |
| 51. | 1971-72 | Southern League Division One North | 497 |
| 52. | 1990-91 | Isthmian League Division Two North | 485 |
| 53. | 1989-90 | Isthmian League Division Two North | 344 |
| 54. | 1984-85 | Isthmian League Division Two North | 312 |
| 55. | 1975-76 | Southern League Division One North | 311 |
| 56. | 1986-87 | Isthmian League Division One | 298 |
| 57. | 1981-82 | United Counties League Premier Division | 288 |
| 58. | 1988-89 | Isthmian League Division Two North | 288 |
| 59. | 1982-83 | United Counties League Premier Division | 261 |
| 60. | 1987-88 | Isthmian League Division One | 233 |
| 61. | 1955-56 | Delphian League | 0 |
| 62. | 1946-47 | Spartan League Division One East | 0 |
| 63. | 1947-48 | Spartan League Division One East | 0 |
| 64. | 1948-49 | Spartan League Division One East | 0 |
| 65. | 1945-46 | Spartan League East | 0 |
| 66. | 1949-50 | Spartan League Premier Division | 0 |
| 67. | 1950-51 | Spartan League Division One East | 0 |
| 68. | 1951-52 | Delphian League | 0 |
| 69. | 1952-53 | Delphian League | 0 |
| 70. | 1953-54 | Delphian League | 0 |
| 71. | 1960-61 | Delphian League | 0 |
| 72. | 1956-57 | Delphian League | 0 |
| 73. | 1957-58 | Delphian League | 0 |
| 74. | 1962-63 | Delphian League | 0 |
| 75. | 1983-84 | United Counties League Premier Division | 0 |
| 76. | 1985-86 | Isthmian League Division Two North | 0 |
| 77. | 1958-59 | Delphian League | 0 |
| 78. | 1959-60 | Delphian League | 0 |