Back when I was a kid, my family lived on Potrero Hill, but my sister, brother and I all had a kind of dual San Francisco citizenship. We were Mission kids, too.
We walked a dozen blocks every day down 24th Street to St. Peter's Catholic School on Florida Street. It was another world, then. The Mission was blue-collar, and almost all the kids at St. Peter's were Irish or Italian. There were a couple of black kids and a handful of Latinos.
Source: http://www.sfgate.com