Yes, one of the more controversial discoveries by social sciences. We measured this as other countries have developed economically and technologically. Trivedi Jitendra, Sareen Himanshu, Dhyani Dhyani, Mohan Mohan. Rapid urbanization - Its impact on mental health. A South Asian region perspective Indian Journal of Psychiatry. 2008
We found out, soon as communities grow above about 500 or so. It lined up with: https://en.wikipedia.org/wiki/Dunbar's_number
In effect, something in our psychology wants us to know everyone. When you live in a city with 100,000 people. You basically break mentally.
This is why places like Paris have been designed around living in your neighbourhood. Why there's more and more focus about the neighbourhood government being the sovereign most government.