- A. ^ : Includes goals scored in the Football League (including play-offs), Premier League, FA Cup, Football League Third Division North Cup, Football League Cup, Watney Cup, Anglo-Italian Cup, Anglo-Scottish Cup, Football League Group Cup/Football League Trophy, Associate Members' Cup/Football League Trophy and Full Members Cup. Sources: 1904–05 to 1998–99, 1999–2000 onwards.
- B. ^ : Hull were elected to the Football League Second Division for the 1905–06 season.
- C. ^ : 31 goals in the Second Division.
- D. ^ : Hull missed out on promotion to the First Division due to having an inferior goal average to Oldham Athletic.
- E. ^ : 32 goals in the Second Division.
- F. ^ : Club's best performance in the FA Cup, reaching the semi-final.
- G. ^ : 41 goals in the Third Division North.
- H. ^ : Beat Carlisle United 11–1 at home to set a record league victory.
- I. ^ : The 1939–40 season was abandoned with two matches played when the Second World War began. Hull City do not include appearances and goals from those two matches in players' career records.
- J. ^ : Although the Football League did not resume until the 1946–47 season, the FA Cup was contested in 1945–46. From the First Round Proper to the Sixth Round (quarter-final), results were determined on aggregate score over two legs. However, Hull did not participate in the competition this season as the club did not have a ground available until Boothferry Park was built in 1946.
- K. ^ : Set an all time record attendance of 55,019 against Manchester United in the FA Cup.
- L. ^ : Hull were placed in the Football League Third Division on League reorganisation.
- M. ^ : The League Cup competition started in the 1960–61 season.
- N. ^ : Ken Wagstaff, who joined Hull from Mansfield Town during the 1964–65 season, was the Third Division top scorer with 32 goals; nine were scored for Mansfield and 23 were scored for Hull.
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- O. ^ : Hull's Watney Cup semi-final with Manchester United was the first game in English football to be decided by a penalty shoot-out, which was lost 4–3 after the game finished 1–1 after extra time.
- P. ^ : Lost 2–0 to Stoke City.
- Q. ^ : The 1981–82 season saw the introduction of three points for a win instead of two.
- R. a b : Competed in the Football League Group Cup, a successor to the Anglo-Scottish Cup, failing to progress past the group stage in its two seasons. The competition was renamed the Football League Trophy for its second season, but is often referred to as the Football League Group Trophy to distinguish from the more recent Football League Trophy, of which it was a forerunner.
- S. ^ : Keith Edwards, who left Hull for Sheffield United during the 1981–82 season, was the Fourth Division top scorer with 36 goals; one was scored for Hull and 35 were scored for United.
- T. ^ : Hull missed out on promotion to the Second Division due to having an inferior goal difference to Sheffield United.
- U. ^ : Lost 2–1 to Bournemouth.
- V. ^ : 26 goals in the Second Division.
- W. ^ : When the newly formed FA Premier League split from the Football League, the remaining divisions of the Football League were renumbered upwards.
- X. ^ : Lost 2–1 to Leyton Orient on aggregate in the play-off semi-finals.
- Y. ^ : The Second Division was renamed League One as part of a rebranding exercise by the Football League.
- Z. ^ : 27 goals in League One.
- AA. ^ : Promoted to the Premier League via the play-offs, beating Watford 6–1 on aggregate in the semi-final and Bristol City 1–0 in the 2008 Football League Championship play-off Final.
- AB. ^ : Club's best finishing position in the league.
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