Don’t know for sure about the US cities, but Toronto’s (Greater Metropolitan Area, including heavily Jewish Thornhill, just to the North of the city limits) Jewish population is about 185,000 to 200,000, and Montreal’s is about 90,000 to 95,000. This is from fairly reliable sources including the most recent federation studies from both cities. Los Angeles is said to have well over 500,000, and both Boston and Chicago have around 200,000 or a bit more.