As of 2025, the population of Mongolia is approximately 3.57 million people (3 568 978), making it the 132nd most populous country in the dataset of 217 countries, with a 0.04% share of the combined total.
Over the past five years the population of Mongolia changed by +7.27%, and over the past ten years by +17.91%. By five-year growth, Mongolia ranks 77th of 217 countries; in terms of momentum, growth is slowing — from +1.91% to +1.41% per year.
| Year | Population | Diff | Diff % | Share of Universe |
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