San Francisco (people reporting ancestry, 2019 ACS):
Russian - 17,308
Polish - 15,843
Eastern European - 6,828
Ukrainian - 5,383
Hungarian - 3,410
Armenian - 2,865
Czech - 2,672
Lithuanian - 1,983
Romanian - 1,687
Croatian - 1,398
Slovene - 644
Serbian - 617
Slovak - 610
Czechoslovakian - 540
Bulgarian - 528
Yugoslavian - 492
Latvian - 469
Slavic - 297
Macedonian - 143
Albanian - 132
Soviet Union - 131
Estonian - 66
There's probably a few more Slavs and Eastern Europeans included within the 20,000 who identified as "European", and among the 475,000 who selected "other" lol.
The Richmond district in SF is home to many of those Russians and Ukrainians, and there's a handful of businesses with signs in Cyrillic. There's also a cool Orthodox church:
Holy Virgin Russian Orthodox Cathedral, San Francisco by
Michael Layefsky, on Flickr
edit: the Bay Area also is relatively unique in that a small part of it used to be a Russian colony, and the old fort is still there:
https://en.wikipedia.org/wiki/Fort_Ross,_California
California-06504 - Fort Ross by
Dennis Jarvis, on Flickr
Fort Ross Chapel by
Srikanth Srinivasan, on Flickr
There's a river named after them too:
https://en.wikipedia.org/wiki/Russia...r_(California)
Russian Hill in SF also has a connection, unsurprisingly, having been named after a Russian cemetery that was there before the gold rush population boom occurred.