Even if you look at Germany, you will see huge regional differences. If you look at the map of the positive tested, you can clearly see spikes in the huge cities (Berlin, Hamburg, München) and in densely populated regions. You can also still see that the infection density is higher around the places of initial infections (Bavaria for example, many skiing tourists who got infected in Austria/Italy). On the other side, there are less dense populated regions with a noticeably smaller infection rate.

And interestingly, those on holiday seem to have brought it back at a much greater rate than business travelers. E.g. Frankfurt isn't an epicenter despite having the largest airport and a lot of business travel, esp. to China. Many of the early outbreaks can be traced back to either Italy or Austria during Easter holidays. And that's where centers of infection remain.

It's still early enough in the pandemic that the effect you're seeing here might only be that denser areas get it first, not that they get it worse. People in less dense areas do still regularly come in close contact with other people, so there is the potential for the virus to spread there even if the people live spread out on farms or whatever.

Given it a few more months and I suspect that the differences between the urbs and suburbs will be less.