I do not, but I know it is out there some place (maybe the Board of Discipleship located in Nashville) because a few years ago there was a meeting of
the 100 largest UM churches.
I think I could identify a few of them for you:
Church of the Resurrection (Kansas City)
Ginghamsburg
Glide Memorial (San Francisco)
St. Luke's (Indianapolis)
In my Illinois Great Rivers Conference, our two largest churches are First UMC in Springfield and First UMC in Peoria. Peoria used to be the largest church in the entire 9-state North Central Jurisdiction, but now it is only the 2nd biggest church in our conference, losing over 1000 members (a full 1/3) in the last 30 years. This isn't because of bad leadership or bad preaching either. It's just a reality of the community in which it is place and the changing demographics of America.
They are a downtown church in a small Midwestern city, and everyone is getting older on them and moved away. The city center is dead even during the middle of a weekday, let alone on weekends. But they have elected to stay downtown because they know there is a need for the church's ministry there.
Springfield First on the other hand, having a similar location, choose to abandon the downtown and move with its membership to the suburbs. They have continued to grow, but they don't have the same ministry that Peoria First has.
I believe the largest church in Chicago used to be the
Chicago Temple (aka, First UMC, Chicago) located directly across the street from City Hall. Whether it still is or not, I have no idea.
The internet can find some of this out for you if you utilize search engines effectively. I stumbled on this interesting bit of trivia while surfing:
Fastest Growing among the large UM Churches.