Depends on position (assistant, associate, full / TT or not) and type of school (R1 or LAC/ public, private) and other factors (prestige, recruitment, ability to pull in NSF funding, etc.) For all public schools, base salaries are usually public information. There is wide variation.
I don't know the origin of your question, but if you are trying to figure out if this is lucrative work, the answer is definitely NO. Very few PhDs in any field, with few exceptions, can recover the opportunity costs of spending 5+ years in a PhD program. I recently did my own calculation and estimate mine at a quarter of a million dollars, undiscounted. And I have a fully funded fellowship.