"Premier League Champions 17/18", City tweeted soon after the final whistle, when the fifth English top-flight title of its history was assured.
City manager Pep Guardiola might have missed the moment that his first English title was sealed, however, after admitting on Saturday he had a round of golf booked with his son.
It's a happy ending to a disappointing week that saw them dumped out of the Champions League by Liverpool and blow a 2-0 lead in the Manchester derby that would have seen them claim the crown against their bitter rivals.
As City wrapped up the Premier League without having to kick a ball, here are five things we learned.
Instead of City likely clinching the title at home to Swansea next weekend, that game at Etihad Stadium will now be a party and a celebration of one of the Premier League's finest teams which could yet break a slew of records by the end of the season.
We know, obviously, that United have got a lot of talent and a lot of pace and power up front, ' Foster told West Brom's website.
For the millions (and millions) of pounds United spend on their attacking talent, with the likes of Romelu Lukaku, Alexis Sanchez and Paul Pogba starting against West Brom, the Red Devils lacked spark without their academy graduates Marcus Rashford and Jesse Lingard (in addition to Anthony Martial).
The Baggies have scored just 26 Premier League goals in 2017-18, the same total Manchester United have registered in the first half in games alone.
If it weren't for Ben Foster in goal, West Brom would have gone into the game at Old Trafford already relegated. United have won their last five league matches. He is expected to start out on the right-side ahead of Juan Mata.
Chris Brunt's corner to the far post was headed back towards his own goal by Nemanja Matic under pressure from Dawson, with Rodriguez stealing in to head in from close range in the 73rd minute.