A recent report from the Brookings Institution ranks cities for the percentage of the working-age population with reasonably convenient access to transit. The Los Angeles-Long Beach-Santa Ana area evidently reaches 96% of that cross-section.
Unfortunately though, says Josh Stephens:
"That's the good news. The bad news is that, in many of these cities, the buses and trains that residents can board so easily won't necessarily take them where they want to go, or get them there in a timely manner."