Even small countryside towns are more social b/c there is a main street where people hang out on the street.
If you have to get in a car to "do something", your chances of spontaneous interactions go down exponentially.
I washed my bicycle outside last week and some 70-80 year old started up a conversation with me. Other times, going to the laundromat, some 80 year old lady chatted with me. But if I had to get in a car to get coffee or ride my bike, these kind of interactions would not happen. I want to live in a city when I get old and die on my feet.