Yes, in New York City.

https://en.wikipedia.org/wiki/New_York_City_steam_system

Wow, so that's why I've seen steam so often as an element of the NY landscape! Very cool, thank you.

There's one in downtown St. Paul, Minnesota¹, but AFAIK it only serves the downtown, i.e. large government and office buildings and hospitals.

1: http://www.districtenergy.com/

It's how amazon is heating their new buildings in Seattle:

http://www.datacenterknowledge.com/archives/2014/09/17/amazo...

Click baity how?

And that comment is valuable because it shows that it's feasible to do with data center water, which is much less hot than the industrial sources you mentioned.

Huh, I think I read it as "It's amazing how Seattle is is heating their new buildings:".

That remark of mine was unwarranted, while I don't agree the comment makes it clear that it's special to use water from data centers, I didn't get that from it.

The University of Virginia campus has one. It's popular for students to sneak into the steam tunnels.