They won promotion as champions of the Third Division North in 1950–51 and were beaten finalists in the inaugural League Cup final in 1961, losing to Aston Villa 3–2 on aggregate.

[3] Meanwhile, Thornhill's fortunes were on the rise to the extent that in 1905 they laid claim to being the pre-eminent club in the town and changed their name to Rotherham County.

The red and white kit was adopted around 1930 after playing in amber and black, but there was no improvement in the club's fortunes: in 1931 they again had to apply for re-election.

The Millers won the only post-war edition of the Football League Third Division North Cup in 1946 beating Chester 5–4 on aggregate.

[4] This season also saw Rotherham accomplish their highest-scoring second-tier league double, beating Chelsea 6–0 at home (31 October 1981) and 4–1 away at Stamford Bridge (20 March 1982).

[6] The final match of the 2005–06 season, home to Milton Keynes Dons, was a winner-take-all relegation showdown where a scoreless draw kept Rotherham up.

Rotherham United began their second successive year in League One with a 10-point deficit as a result of the CVA which saved the club from liquidation.

The Millers spent the majority of the 2007–08 season in the automatic promotion places but in mid-March 2008 it was revealed that Rotherham had again entered administration and would be deducted 10 points.

Local businessman Tony Stewart then took over as chairman for the 2008–09 season and took the club out of administration via a Creditors Voluntary Agreement, resulting in a 17-point deduction.

[8] The Millers were subsequently forced to leave Millmoor, their home of over 100 years, for the Don Valley Stadium in Sheffield, after disputes with the landlords.

This included victories over higher league opposition in the form of Wolverhampton Wanderers, Southampton, Sheffield Wednesday, Leicester City and Leeds United.

Mark Robins kept the majority of the team together from the 2008–09 campaign, whilst bolstering his squad with high calibre signings in the form of Nicky Law and the prolific goalscorer Adam Le Fondre.

The 2009–10 season started well until Robins controversially departed to rivals Barnsley in September, leaving the Millers at the top of the league.

Former manager Ronnie Moore replaced him and led the club to their first ever play-off final and first trip to the new Wembley Stadium, where they lost 3–2 loss.

[10] In the final against Leyton Orient, the game went to a penalty shoot-out, where two saves from Adam Collin secured a second successive promotion for the club.

[11] In the 2014–15 Championship season, Rotherham's first after a nine-year absence, their survival was jeopardised by a points deduction for fielding the ineligible Farrend Rawson during their home win against Brighton & Hove Albion,[12] Rawson's loan had expired two days prior to the match, and despite the club insisting it was an external administrative error, they were subsequently thrown back into a relegation battle.

[14] Rotherham sold key players from their promotion winning campaigns before the 2015–16 season, including Ben Pringle, Craig Morgan and Kari Arnason.

Evans left the club in September[15] and former Leeds United manager Neil Redfearn was appointed as his replacement,[16] being sacked in February 2016 after a run of six defeats in eight games.

[28] Early in the 2022–23 season, manager Paul Warne departed for Derby County,[29] being replaced by Exeter City boss Matt Taylor.

It was hoped that the 4,500 capacity stand which is single tiered, all seated and covered, would be completed sometime during the 2006–07 season, but this had not come to fruition by the time the ground became disused in 2008.

Construction started in June 2011 and the first game played at the stadium was a pre-season match between Rotherham and Barnsley, held on 21 July 2012.

[35] The New York Stadium made its league debut on 18 August 2012, in which Rotherham beat Burton Albion 3–0,[36] Daniel Nardiello scoring the first competitive goal in the ground.