Viable at 30,000 people

Lichtenstein, Monaco, San Marino, and Mount Athos.

From the BDI.

Comments

[Robert Paterson]

30,000 is a large city state of ancient time when you had to rely on food grown locally close enough for a horse and wagon to get it into the city - most city states were no larger than 30k

Rome at 400ad - a million plus. By 500 25,000

A new reality?

[Robert Paterson]

Sorry here is the more accurate number - 75,000 to 100,000 residents by 500 - still huge drop

Now think of New York

[zenpundit]

As Mt. Athos does not have to concern itself with normal population growth - unless the monks are splitting like amoeba - they are something of an outlier.