It saw Steve Evans' men take a huge step towards survival by moving nine points ahead of Wigan, who they play next week.
Here is a numerical analysis of Saturday's win at the John Smith's Stadium.
-16 - The number which the Millers' goal difference currently stands after the two-goal boost, now no worse than any of the three sides in the bottom three.
1 - The number of away wins the Millers have now recorded this season with a two-goal margin.
2 - The number of debutants in the Millers starting XI as Daniel Lafferty and Farrend Rawson made their first starts following loan moves.
2 - The number of clean sheets the Millers have now recorded this season with Kirk Broadfoot playing at centre-back for the entire 90 minutes.
2 - The number of red cards the Millers have received this season after Lee Frecklington's second-half dismissal, his second of his career.
3 - The number of 2-0 wins the Millers have recorded this season following previous victories over Blackburn and Ipswich.
3 - The number of away wins the Millers have recorded this season and their first of 2015.
3 - The number of goals that Kari Arnason has scored this season, equalling his best ever tally.
4 - The number of changes boss Steve Evans made to his starting XI as the two debutants, Frecklington and Connor Sammon came into the side.
4 - The number of points taken off Huddersfield this season following Boxing Day's 2-2 draw at New York Stadium and this win.
5 - The number of games since striker Matt Derbyshire's last goal following a previous run of four in five games.
5 - The number of games the Millers have won on a Saturday afternoon this season, the first time they have won on consecutive weeks.
6 - The number of teams who have beaten Huddersfield on their own ground this season.
7 - The number of games since the Millers' last away win, the success in West Yorkshire ending a run going back to the game at Wigan in December.
7 - The number of games since the Millers' last clean sheet, the shutout was the first since the 2-0 win over Ipswich.
7 - The number of games where the Millers have led at half-time following Arnason's 44th-minute goal. They have gone on to win five of them.
8 - The number of clean sheets the Millers have kept this season after a rare afternoon where Adam Collin's goal was not breached.
9 - The number of points the Millers are above the drop zone after their win and defeats for Millwall and Wigan.
9 - The number of wins the Millers have recorded in the Sky Bet Championship this season.
12 - The number of shots on goal the Millers had throughout the 90 minutes at the John Smith's Stadium.
13 - The number of goals the Millers have scored which has been the opening goal in the game after Arnason broke the deadlock.
13 - The number of away goals the Millers have scored this season after they bagged twice for just the third time on the road.
13 - The number of first-half goals the Millers have scored this season following Arnason's effort.
23 - The number of games since the Millers last beat Huddersfield as this win ended a drought going back to 1992.
24 - The number of second-half goals the Millers have scored this season after Connor Sammon's effort made the game safe after the break.
28 - The number of years since the last time the Millers won at Huddersfield, going all the way back to 1987.
29 - The number of signings boss Evans has made this season after Rawson's loan deal from Derby was confirmed on Saturday morning. There has also been 29 debutants this season.
546 - The number of total minutes the Millers have been in front in games this season after adding 46 to their tally.
