The UMC doesn't have an "official" stance on the matter. They allow a variety of views. That being said, the overwhelming majority of Methodists are Amillennial.
But the General Conference has never settled on an "official" stance on the End Times.
The same is true of the Anglican and Episcopal Churches. I don't think either of them have an "officially" stated view. But they are both nearly universally Amillennialist.
Both the Catholic and Eastern Orthodox Churches are almost universally Amillennial (Though, I'm not sure they have "officially" declared this). ALL Churches of Christ are Amillennial (some are even Preterist...which is an extreme version of it that borders on heresy).
Nearly ALL Presbyterians are Amillennial.
Some Baptists are Amillennial (the more Conservative ones tend to be Dispensational Premillennial, but the more moderate American Baptist and Northern Baptists are mostly Amillennial).
Nearly all Pentecostals are Dispensational Premillennial, though in recent years, some have embraced Postmillennial views...especially those who are influenced by "Dominion Theology".
Lutherans are almost universally Amillennialists (though I have heard of some that are not, but they are the exception).
Some few Catholics, Baptists, Methodists, Presbyterians, and Episcopalians are "Classical" or "Historic" Premillennial...but they are a TINY minority (remember, that is the one that is DIFFERENT from the "Pretrib Rapture" Dispensational Premillennialism).
If you asked 100 Methodists, those who didn't say, "huh?" nearly all of them would be Amillennialists.
Amillennialism is the view of about 75% of world Christianity.