1919-20: Despite finishing next to the bottom, Lincoln were relegated out of the League. Grimsby, who had finished bottom, were more fortunate in that they became a foundermember of the new Division 3.
1920-21: Lincoln City won the Midland Counties League for a third time, and for a third time had achieved an immediate return to the Football League by winning the championship of the League they were competing in.
1921-22: Lincoln City became founder members of the 3rd Division North. The other members were: Stockport County, Grimsby, Accrington Stanley, Darlington,Hartlepools, Stalybridge Celtic, Crewe Alexandra, Walsall, Southport, Ashington, Wrexham, Chesterfield, Wigan Borough, Nelson, Barrow, Tranmere Rovers, Halifax and Rochdale.
1924-25: The Midland League side Alfreton put paid to Lincoln City's FA Cup hopes.
1926-27: Lincoln City signed Albert Iremonger from Notts County. Many people felt that Albert, one of the tallest players ever in League football, was the best goalkeeper never to represent his country.
1927-28: The Imps were runnersup in the 3rd Division North.
1928-29: In the FA Cup, Lincoln met Leicester City at Sincil Bank offer beating Carlisle and Lancaster in the early rounds. The crowd of over 16,000 was a newattendance record for Sincil Bank.
1929-30: The South Park Stand, which included the club offices, was destroyed by a disastrous fire. The fire also destroyed all the club records. The stand was rebuilt in eight weeks but the records were gone for ever.
1930-31: City were beaten to the 3rd Division North championship by Chesterfield, who led the league by one point. Despite scoring 102 goals, the Imps had to wait another year.
1931-32: Lincoln City's first League honour champions of the 3rd Division North. They finished level on 57 points with Gateshead, but with 106 goals for and only 47 against the Imps took the title on goal average. The 11 players who represented the club on the most occasions were: Dan McPhail, Albert Worthy, James Smith, Charles Pringle (captain), Alfred Young, Walter Buckley, Phillip Cartwright, Frank Keetley, Alan Hall, Harold Riley and George Whyte, Alan Hall scored more League goals in a season (42) than any Lincoln player before or since.
1932-33: The Imps were relegated to the 3rd Division North in the company of MiIlwall. Alan Hall, the goal scoring machine of the previous season, was transferred to Tottenham Hotspur.
1936-37: Lincoln City missed out on promotion again, finishing runnersup to Stockport County.
1939-45: The Football League programme was suspended for the course of World War Two.