I can't think of any teacher in a US school who is called by his or her first name. I can imagine it happening, particularly in a private school with some kind of philosophy, but it's just not part of my experience. In almost any public school in any part of the country, I would expect Mr./Mrs./Ms. Jones, or where I am in western Michigan the unusual Mr./Miss Jones dichotomy.
When I was an undergrad in the 1980s, I addressed most of my professors as Dr. Smith, Dr. Reitmayer, Dr. Singh. Off the top of my head I can only think of two professors who sometimes went by first names. They were both female and younger than many of the male professors.
In graduate school (early 1990s) most of the professors (public university in the Midwest) went by first names (Bob, John, Tom, Marilyn). A few of the elderly professors went by Dr. Müller, or whatever. That was in a German Dept. and most of them were German and more conservative/traditional than the native Americans. The younger Germans went by first names.
When I went back to school in the 2000s, most undergraduate professors (public university in the US) went by first names (Carol, Margarete, Pat). Some of them were about my age, but I don't think that had anything to do with it, because the "traditional" undergrads called them by first names, too.
To sum up, in my experience in the US, college professors may go by first name, elementary and secondary school teachers most likely do not.
OT: #33 Is it in Orange County? Why do you ask? Do you think it's any different in Orange County as opposed to say, Los Angeles County or San Diego County?
Even more OT: Tante Wiki tells me there is an Orange County, Indiana, with an Orangeville. I can't help wondering about the origin of the names. House of Orange? Orange Order? Certainly they don't grow oranges in southern Indiana. If they do, I'm moving there.