It was a big church with a chunk of the parishioners (50%) in the urban renewal survey area. I’m a convert to the church, but the sense I get is back then, when this survey was conducted, there were parish districts and you were supposed to go to the church for the district you lived in. Another interesting thing about the demographics is that it had a tiny white population, 3%, while the rest was Black. It is still a predominately African American Catholic Church.
Anyway, here’s the 1957 survey for St. Augustine: