As of 2025, the population of Tonga is approximately 0.10 million people (103 742), making it the 193rd 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 Tonga changed by -1.86%, and over the past ten years by -2.22%. By five-year growth, Tonga ranks 194th of 217 countries; in terms of momentum, the decline is accelerating — from -0.07% to -0.37% per year.
| Year | Population | Diff | Diff % | Share of Universe |
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