How many people live in Vatican City?

How to get close to this number

Reason from the area. Half a square kilometre is the size of a large city park, and most of it is occupied by a basilica, museums, gardens and offices rather than housing. A residential population in that space has to be in the hundreds, not the thousands — the buildings that exist are not dwellings.

The composition is what makes it unique: citizenship here is by appointment rather than by birth, tied to a role in the institution. When the role ends, so does the citizenship. It is the only state in the world where nobody is born a citizen and nobody keeps citizenship for life by default.

The absence of hospitals and births follows directly and has a practical consequence: every resident was a citizen of somewhere else first, and the population is entirely adult, overwhelmingly male and turns over completely across a generation. A population statistic for this state describes a staff roster rather than a society.