I live in a zip code that has everything: Section 8 housing, affluent houses “on the hill”, middle income families, senior housing, and, because the area was originally rural, small family farms. I don’t think zip codes can tell you everything that’s there.
Although we’re Hispanic/Native American, you can’t tell that by our last name.
Did our kids get into every UC? No. Could they tell what race we were? I don’t know how they would until they received the high school transcripts, after their acceptances and SIR’s.