Not all that many, but enough.
My town (pop. 19,000) has one Catholic Church.
Each of the towns of about the same size in the area each has one each, also.
I don't have the numbers, but we are a minority in the area.
Baptist, Church of Christ and Methodists are predominate.
The irony is that until a few weeks ago, I was a WASP. I converted to Catholicism this year and was confirmed last Saturday. I grew up in the northeast where Catholics were as thick as flies and convert when I move to the south.