Avoiding defeat would have prolonged the inevitable but a second-half header from striker Jay Rodriguez ensured City sealed their fifth top-flight title and first since 2014 with five games remaining - a joint Premier League record.
Jose Mourinho has said he wants to see greater consistency from Paul Pogba, even if he doesn't expect him to match last week's heroic performance against Manchester City every game.
It was City's third title in seven seasons and easily its most convincing, with Pep Guardiola's team 16 points clear and still having five games to play this season.
While they missed out narrowly on that particular record, here are some of the best Opta numbers from City's special Premier League season.
Here's how the footballing world reacted to City's title win. It was always a matter of when rather than if City would be champions after they led the way for most of the season. "One more touch to control the ball, one more flick, one more trick".
"I have won titles, I would not be happy if someone say won title if someone lose a match".
"I trust in my work, that is for sure", added Mourinho.
Manchester United's French midfielder Paul Pogba celebrates scoring their second goal to equalise 2-2 during the English Premier League football match between Manchester City and Manchester United at the Etihad Stadium in Manchester, north west England, on April 7, 2018. He talked about their poor attitude and said they were too complacent and too relaxed.
"You do not win titles with inconsistency, you win with quality".
United should have had a first-half penalty after Craig Dawson caught Ander Herrera, but complacency seeped in and West Brom showed fight under caretaker boss Darren Moore that has been sorely lacking this season. We could not play fast, we could not think fast, everything was complicated. But I expect you to be consistent in a certain level.
West Brom's official Twitter account tweeted you're welcome to Manchester City, while its fans at Old Trafford sang: We've won you the league, Manchester City, we've won you the league. "It is one of the things that we have to improve".