As of 2025, the population of Sierra Leone is approximately 8.82 million people (8 819 794), making it the 100th most populous country in the dataset of 217 countries, with a 0.11% share of the combined total.
Over the past five years the population of Sierra Leone changed by +11.47%, and over the past ten years by +25.32%. By five-year growth, Sierra Leone ranks 42nd of 217 countries; in terms of momentum, growth is slowing — from +2.37% to +2.19% per year.
| Year | Population | Diff | Diff % | Share of Universe |
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