[eschaton]

Pittsburgh has Squirrel Hill within city limits, which has remained around 40% Jewish since the mid 20th century, with roughly equal levels of orthodox and secular. I have heard that Pittsburgh has the largest urban Jewish community (within the core city) next to NYC.

There used to be a much larger secular Jewish community in many other Pittsburgh neighborhoods which has since dispersed. AFAIK there is no particular "Jewish suburb" in the Pittsburgh area, with the suburban Jewish population just evenly distributed through upper-middle class areas.