Between 1891 and 1912 they were members of the Football League. They are currently in the Conference North, and play their home matches at The Northolme, which has a capacity of 4,304 (504 seated, 3,800 standing). They are known as "Trinity" or the "Blues".
After several years of struggle, the club was voted out of the league in 1912, being replaced by local rivals Lincoln City, and returned to the Midland League. During the 1940s, the club recorded its record attendance, when 9,760 saw a match against local rivals, the then non-league Scunthorpe United. The club won three Championships (1928, 1949 and 1967 - by which time the league had become the Midland Counties League) before becoming founder members of the newly-created Northern Premier League in 1969, where it remained until 2004.
At the end of the 2003-4 season, the club finished in a high enough position to become founder members of the newly-created Conference North.
As a non-league club, Trinity have recorded five wins against Football League opposition (a feat known in English football as giant-killing). Victories were recorded against Crewe Alexandra in 1928 and 1931, Port Vale in 1937, Gateshead in 1938 and Mansfield Town in 1946.
Trinity claim to be one of the few English clubs never to have experienced a relegation, as they were voted out of the Football League rather than being directly relegated. They were also the first and last opponents of Middlesbrough Ironopolis F.C.
Chairman:Pat Lobley
Manager:Steve Charles
Assistant Manager:Dave Reeves
Coach:Steve Blatherwick