Looking for info about a local Polish restaurant, I came up with this link to Polish restaurants, Delis and bakeries across the USA.
It is hard to believe that less than 200 Polish food establishments exist in the entire country. However, as far as the SF Bay Area is concerned, they've pretty much nailed it without crossing into general Eastern European cuisine. The only place they missed was Polish Deli in Palo Alto which opened about the time this list was published. There is also a long closed restaurant in Los Altos on the list, so it sort of evens out.
As far as the rest of the country, I notice that Pierogi Palace in Cleveland is missing.
However, this list might be a good starting point for people searching for Polish food in your own neck of the woods.