It's easy enough to find out, but difficult to wrap one's mind around for larger provinces.
I assume all provinces keep some sort of record of urban/rural areas in a way that's easy enough to understand. Ours, for example, is this:
The dark pink is urban, which for us is basically defined economically. It's where there's high diversification, lots of opportunity, lots of people, etc. It's the parts of Newfoundland that are successful, self-sufficient, and can last.
The lighter pink is larger towns that are regional service hubs (and their service area). These often have a wide variety of service sector opportunities (for example, hospitals and schools and shopping malls and airports).
The light purple is first-level rural which have smaller regional service centres that are broken up - so perhaps the school is in one medium-sized town, while the hospital is in another, and the local industries in a third.
The dark purple is second-level rural which is sparsely-populated areas with basically no economic activity but anchored by a single-industry town. This is where rural communities are surviving only because everyone there who is employed works at the regional plant, or mine, or factory, or whatever it is. And there's little else.
And the blue is third-level rural, which is basically where hope dies. This is where abandoned houses dot the communities, where anyone who is employed is either in the public service or commuting to Alberta (or St. John's).
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So, if you overlay our federal ridings over that, you can get some idea which areas could go crazy in the long term.
I believe the federal riding of Labrador is the smallest in population, with 26,728. It doesn't take much for a candidate to win there.
The rest are all in the neighbourhood of 75,000-80,000. Only two are majority urban (St. John's East and St. John's South-Mount Pearl) and only one other has any urban, as the province defines it, at all (Avalon).
I think here, though, the situation is reversed. I can't imagine a Trump-like candidate could ever win here, but if one did, I would expect him to perform better in the capital than the countryside. We're progressive enough socially, but barring furor with the federal government, the economy is what matters here and as far as that is concerned it's traditionally (until Harper) been conservative in urban areas and liberal in rural ones.