As of 2025, the population of San Marino is approximately 0.03 million people (34 109), making it the 213th most populous country in the dataset of 217 countries, with a 0.00% share of the combined total.
Over the past five years the population of San Marino changed by -1.90%, and over the past ten years by +3.68%. By five-year growth, San Marino ranks 196th of 217 countries; in terms of momentum, the decline is accelerating — from +1.11% to -0.38% per year.
| Year | Population | Diff | Diff % | Share of Universe |
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