Division One: (highest-placed finish): 5th 1934/35

Division Two: Champions: 1900/01, 1933/34; Runners-Up: 1928/29; Promoted via Play-Offs: 1997/98

Division Three North: Champions: 1925/26, 1955/56; Runners-Up: 1951/52

Division Three South: (highest-placed finish): 13th 1920/21

Division Three: Champions: 1979/80; Runners-Up: 1961/62; Promoted: 1990/91

Division Four: Champions: 1971/72; Runners-Up: 1978/79; 1989/90

League Two: Play-Off Runners-Up: 2005/06

National League: (highest placed finish): 3rd 2014/15

National League Play-Off Winners: 2015/16

Play-Off Runners-Up: 2014/15

FA Cup: Semi-Finalists: 1936, 1939

League Cup: (best performance) Fifth Round: 1980, 1985

League Group Cup: Winners: 1982

Football League Trophy: Winners: 1998; Runners-Up: 2008

FA Trophy: Runners-Up: 2013, 2016

Lincolnshire Senior Cup: Winners: 1885/86, 1888/89, 1896/97, 1898/99, 1899/1900, 1900/01, 1901/02, 1902/03, 1905/06, 1908/09, 1912/13, 1920/21, 1922/23, 1924/25, 1928/29, 1929/30, 1932/33, 1935/36, 1936/37, 1937/38, 1946/47, 1949/50, 1952/53, 1967/68, 1972/73, 1975/76, 1979/80, 1983/84, 1986/87, 1989/90, 1991/92, 1992/93, 1993/94, 1994/95, 1995/96, 1999/2000, 2011/12, 2012/13, 2014/15. Runners-Up: 1886/87, 1909/10, 1910/11, 1911/12, 1914/15, 1919/20, 1923/24, 1930/31, 1931/32, 1933/34, 1934/35, 1945/46, 1947/48, 1948/49, 1950/51, 1953/54, 1957/58, 1960/61, 1970/71, 1974/75, 1990/91, 1996/97, 2003/04, 2008/09, 2010/11.

Midland League: Champions: 1910/11, 1930/31, 1932/33, 1933/34, 1946/47

Full Members’ Cup: (best performance): Second Round: 1991/92

Anglo-Italian Cup: (best performance): 2nd (English, Group One): 1993/94

Anglo-Scottish Cup: (best performance): Preliminary Stage: 1980/81

Puma Youth Alliance Cup: Winners: 2008/09

Midland Youth Cup: Winners: 2005/06, 2009/10

Copa de Ibiza: Winners: 2003/04