In Canada North Preston, Nova Scotia (an almost all-Black community dating back to the 18th century) comes immediately to mind.
In rural Ontario, there are the Kashubian settlements around Barry's Bay in the Ottawa valley dating back to the mid-19th century. Today over 50% declare Polish ancestry - the only rural Eastern European area in Eastern Canada.
https://www.insideottawavalley.com/c...ubian-culture/
Also there are sizeable German-speaking Mennonite communities such as Wellesley Township in Waterloo region. 100 years ago Berlin (now Kitchener) would have stood out as a German rather than British-dominated city but in the post-WWII period the Kitchener-Waterloo region grew rapidly, diversified and today is no longer majority German descent.