They have done fantastically well this campaign, and their league standing has made me blink once or twice, considering where they once were at the start of the season.
Sections of fans were calling for Sam Allardyce's head not too long ago, but in a few short months, life is rosy at Upton Park.
Sitting in seventh, there can't be many complaints now from those disgruntled Hammers supporters.
Allardyce has not been my cup of tea with his playing style, but he seems to have got the backing of his players and everyone at the club. That has been pivotal to their success this season and he's hoping it can continue.
OK, so there has been an undoubted bit of luck along the way, but it's great to see a club like West Ham mixing it up at the top of the table.
Reassuringly for Hull City, though, is that the Hammers were once in the perilous position the Tigers now find themselves in.
They've shown how things can be turned around through determination and hard work, and let's not forget, Allardyce has been at West Ham for almost four years.
Their present success has been a long time coming, and maybe now the Hammers are only starting to see the rewards through sticking with Big Sam.
He'll give City a lot of respect and who knows, maybe against all the odds, the Tigers can pull off a similar result to that seen against Sunderland on Boxing Day.
A key figure over the last few weeks for West Ham has been their fit-again forward Andy Carroll.
It's taken a while for the striker to get back into the swing of things after being plagued by ankle and foot injuries throughout his time at Upton Park.
However, now he's back to full fitness, he's starting to find the back of the net and he is where the main danger lies for City on Sunday.
Carroll has had to deal with a lot of pressure on his shoulders since a big-money move to Liverpool fell flat, but he's finding his feet at West Ham.
Meanwhile, up front, City have their own problems in finding a fit striker.
Without Nikica Jelavic and Abel Hernandez, Steve Bruce has to come up with a grand plan to take down the resurgent Hammers in front of an expectant crowd.
Whether that means fielding want-away forward Yannick Sagbo up front, or persevering with Robbie Brady and Tom Ince, it will take something big to break down West Ham.
In the home fixture back in September, City had Hernandez and Mohamed Diame to thank in securing a 2-2 draw that day. But without the pair for the trip down South, it's going to be a difficult afternoon. There are some positives to take, though.
The Tigers can point to the Hammers' recent 'slump' in form, if you can call it that. Without a win for almost a month, and suffering a torrid Christmas period, it's been a story of draws for the past four weeks for Allardyce's men.
Confidence would have been partially restored after knocking Everton out of the FA Cup on penalties on Tuesday night, but like any fixture, anybody can be beaten on any given day.
With a Cup break on the horizon, City have to approach this game with an all-guns-blazing attitude.
No game next week means that the Tigers have a week off to recuperate after a testing month, so why not go at the Hammers and get them?
To come away from the capital with all three points would be fantastic but, as I've said on many occasions in the past, a draw would be a welcome result.
Given the current injury situation, it's going to take a slice of luck – which has shied away from City this season – to get anything from the game. But let's be positive and upset the odds at Upton Park.
