The latest officially reported population of Poland was 36,435,861 in 2025 vs 8,819,794 people in Sierra Leone in 2025. In 2026, based on the adjusted UN estimation, the current Poland's population is 36,007,074 people compared to 9,090,531 in Sierra Leone.
Population statistics:
- Poland's population is 3.96 times bigger than Sierra Leone's.
- Poland is ranked the 47th most populous country in the world, while Sierra Leone is the 100th.
- The countries together account for 0.54% of the world: 0.43% for Poland vs 0.11% for Sierra Leone.
- For the last 10 years, Poland has had an average growth rate of -0.38% per year vs +2.29% in Sierra Leone.
- Since 2006, the population of Poland has decreased from 38.1M people to 36M (5.6% decline), while Sierra Leone has grown from 5.62M to 9.09M (61.6% growth).
Poland vs Sierra Leone: population by year and forecast
| Year | Population | |
|---|---|---|
Poland
|
Sierra Leone
|
|
| 2100 | 18,452,579 | 16,107,087 |
| 2099 | 18,644,857 | 16,121,940 |
| 2098 | 18,838,707 | 16,135,035 |
| 2097 | 19,033,962 | 16,149,905 |
| 2096 | 19,231,896 | 16,160,672 |
| 2095 | 19,431,204 | 16,169,304 |
| 2094 | 19,634,214 | 16,168,902 |
| 2093 | 19,840,304 | 16,173,609 |
| 2092 | 20,049,969 | 16,170,778 |
| 2091 | 20,263,764 | 16,163,901 |
| 2090 | 20,482,150 | 16,154,165 |
| 2089 | 20,705,051 | 16,142,526 |
| 2088 | 20,933,750 | 16,128,775 |
| 2087 | 21,167,790 | 16,112,585 |
| 2086 | 21,407,163 | 16,085,549 |
| 2085 | 21,652,018 | 16,064,212 |
| 2084 | 21,902,736 | 16,040,563 |
| 2083 | 22,159,983 | 16,006,923 |
| 2082 | 22,423,109 | 15,970,872 |
| 2081 | 22,691,495 | 15,930,880 |
| 2080 | 22,964,515 | 15,892,665 |
| 2079 | 23,242,960 | 15,850,728 |
| 2078 | 23,524,184 | 15,801,450 |
| 2077 | 23,811,918 | 15,750,408 |
| 2076 | 24,102,012 | 15,695,310 |
| 2075 | 24,395,355 | 15,635,345 |
| 2074 | 24,691,719 | 15,580,279 |
| 2073 | 24,990,908 | 15,512,655 |
| 2072 | 25,290,453 | 15,442,481 |
| 2071 | 25,590,102 | 15,370,747 |
| 2070 | 25,889,034 | 15,293,426 |
| 2069 | 26,187,633 | 15,212,664 |
| 2068 | 26,485,171 | 15,124,069 |
| 2067 | 26,780,961 | 15,028,190 |
| 2066 | 27,074,124 | 14,931,295 |
| 2065 | 27,364,039 | 14,833,794 |
| 2064 | 27,650,950 | 14,736,872 |
| 2063 | 27,934,132 | 14,638,180 |
| 2062 | 28,212,240 | 14,525,736 |
| 2061 | 28,487,283 | 14,420,068 |
| 2060 | 28,757,525 | 14,307,451 |
| 2059 | 29,025,705 | 14,194,972 |
| 2058 | 29,288,751 | 14,077,124 |
| 2057 | 29,548,996 | 13,957,197 |
| 2056 | 29,806,770 | 13,832,494 |
| 2055 | 30,060,951 | 13,702,508 |
| 2054 | 30,311,416 | 13,576,231 |
| 2053 | 30,559,065 | 13,440,929 |
| 2052 | 30,801,964 | 13,299,910 |
| 2051 | 31,043,690 | 13,152,910 |
| 2050 | 31,281,762 | 13,006,688 |
| 2049 | 31,516,893 | 12,863,637 |
| 2048 | 31,748,736 | 12,712,671 |
| 2047 | 31,978,608 | 12,566,944 |
| 2046 | 32,205,877 | 12,411,042 |
| 2045 | 32,431,013 | 12,254,651 |
| 2044 | 32,653,012 | 12,088,895 |
| 2043 | 32,873,136 | 11,928,393 |
| 2042 | 33,090,733 | 11,767,372 |
| 2041 | 33,303,578 | 11,599,942 |
| 2040 | 33,514,705 | 11,428,331 |
| 2039 | 33,722,530 | 11,259,845 |
| 2038 | 33,926,660 | 11,097,180 |
| 2037 | 34,126,585 | 10,928,754 |
| 2036 | 34,323,967 | 10,757,928 |
| 2035 | 34,515,669 | 10,582,918 |
| 2034 | 34,704,048 | 10,411,088 |
| 2033 | 34,887,791 | 10,238,503 |
| 2032 | 35,067,502 | 10,059,929 |
| 2031 | 35,242,658 | 9,881,109 |
| 2030 | 35,410,392 | 9,705,485 |
| 2029 | 35,572,635 | 9,529,493 |
| 2028 | 35,725,650 | 9,358,412 |
| 2027 | 35,870,384 | 9,177,288 |
| 2026 | 36,007,074 | 8,998,902 |
| 2025 | 36,435,861 | 8,819,794 |
| 2024 | 36,559,233 | 8,642,022 |
| 2023 | 36,687,353 | 8,460,512 |
| 2022 | 36,821,749 | 8,276,807 |
| 2021 | 36,981,559 | 8,094,602 |
| 2020 | 37,515,748 | 7,912,558 |
| 2019 | 37,965,475 | 7,731,991 |
| 2018 | 37,974,750 | 7,554,563 |
| 2017 | 37,974,826 | 7,379,299 |
| 2016 | 37,970,087 | 7,205,328 |
| 2015 | 37,986,412 | 7,037,655 |
| 2014 | 38,011,735 | 6,876,385 |
| 2013 | 38,040,196 | 6,714,051 |
| 2012 | 38,063,164 | 6,551,080 |
| 2011 | 38,063,255 | 6,387,251 |
| 2010 | 38,042,794 | 6,222,714 |
| 2009 | 38,151,603 | 6,055,646 |
| 2008 | 38,125,759 | 5,894,722 |
| 2007 | 38,120,560 | 5,749,352 |
| 2006 | 38,141,267 | 5,624,466 |
| 2005 | 38,165,445 | 5,501,712 |
| 2004 | 38,182,222 | 5,355,717 |
| 2003 | 38,204,570 | 5,177,687 |
| 2002 | 38,230,364 | 4,971,435 |
| 2001 | 38,248,076 | 4,692,716 |
| 2000 | 38,258,629 | 4,423,611 |
| 1999 | 38,660,271 | 4,318,043 |
| 1998 | 38,663,481 | 4,295,785 |
| 1997 | 38,649,660 | 4,253,716 |
| 1996 | 38,624,370 | 4,199,210 |
| 1995 | 38,594,998 | 4,179,179 |
| 1994 | 38,542,652 | 4,173,105 |
| 1993 | 38,461,408 | 4,157,130 |
| 1992 | 38,363,667 | 4,166,366 |
| 1991 | 38,246,193 | 4,246,267 |
| 1990 | 38,110,782 | 4,196,828 |
| 1989 | 37,961,529 | 4,034,037 |
| 1988 | 37,824,487 | 3,934,517 |
| 1987 | 37,668,045 | 3,829,718 |
| 1986 | 37,456,119 | 3,728,380 |
| 1985 | 37,201,885 | 3,638,438 |
| 1984 | 36,904,134 | 3,558,758 |
| 1983 | 36,571,808 | 3,481,646 |
| 1982 | 36,230,481 | 3,408,183 |
| 1981 | 35,898,587 | 3,338,940 |
| 1980 | 35,574,150 | 3,272,089 |
| 1979 | 35,247,217 | 3,207,499 |
| 1978 | 34,965,600 | 3,145,517 |
| 1977 | 34,689,050 | 3,085,354 |
| 1976 | 34,356,300 | 3,028,820 |
| 1975 | 34,015,199 | 2,974,657 |
| 1974 | 33,678,899 | 2,920,459 |
| 1973 | 33,357,200 | 2,866,955 |
| 1972 | 33,055,650 | 2,814,388 |
| 1971 | 32,783,500 | 2,763,222 |
| 1970 | 32,664,300 | 2,712,286 |
| 1969 | 32,548,300 | 2,661,365 |
| 1968 | 32,294,655 | 2,611,532 |
| 1967 | 31,987,155 | 2,562,384 |
| 1966 | 31,681,000 | 2,514,638 |
| 1965 | 31,444,950 | 2,468,666 |
| 1964 | 31,139,450 | 2,424,390 |
| 1963 | 30,712,000 | 2,382,258 |
| 1962 | 30,308,500 | 2,342,242 |
| 1961 | 29,964,000 | 2,304,227 |
| 1960 | 29,637,450 | 2,268,356 |
Data sources: United Nations | World Population Prospects (2026–2100, retrieved 2026-07-08); World Bank | Health (1960–2025, retrieved 2026-07-08).
GeoRank.org/population/poland/sierra-leone | CC BY 
From 2006 to 2016, the population of Poland decreased by 171,180 people (a 0.45% decline), while Sierra Leone gained 1,580,862 people (a 28.1% growth).
For the next 10 years, from 2016 to 2026, Poland lost 1,963,013 people (a 5.17% decline), while Sierra Leone's population increased by 1,885,203 people (a 26.2% growth).
Poland was ranked 32nd most populous country in 2006 and is 47th in 2026. Sierra Leone was ranked 105th in 2006 and ranked 100th now.
The UN's World Population Prospects forecasts that in 24 years (in 2050) Poland's population will shrink by 13.1% to 31,281,762 people with a rank change from 47th to 61st. The population of Sierra Leone will increase by 43.1% to 13,006,688 people and rank change from 100th to 91st.
Sierra Leone is projected to reach its peak in 2093 at 16.2M people, while Poland's population already peaked in 1998 at 38.7M people and is projected to decrease to 18.5M people by 2100.
Population growth rate by year
| Year | Growth rate | |
|---|---|---|
|
Poland
|
Sierra Leone
|
|
| 2100 | -1.03% | -0.09% |
| 2099 | -1.03% | -0.08% |
| 2098 | -1.03% | -0.09% |
| 2097 | -1.03% | -0.07% |
| 2096 | -1.03% | -0.05% |
| 2095 | -1.03% | 0.002% |
| 2094 | -1.04% | -0.03% |
| 2093 | -1.05% | 0.02% |
| 2092 | -1.06% | 0.04% |
| 2091 | -1.07% | 0.06% |
| 2090 | -1.08% | 0.07% |
| 2089 | -1.09% | 0.09% |
| 2088 | -1.11% | 0.1% |
| 2087 | -1.12% | 0.17% |
| 2086 | -1.13% | 0.13% |
| 2085 | -1.14% | 0.15% |
| 2084 | -1.16% | 0.21% |
| 2083 | -1.17% | 0.23% |
| 2082 | -1.18% | 0.25% |
| 2081 | -1.19% | 0.24% |
| 2080 | -1.2% | 0.26% |
| 2079 | -1.2% | 0.31% |
| 2078 | -1.21% | 0.32% |
| 2077 | -1.2% | 0.35% |
| 2076 | -1.2% | 0.38% |
| 2075 | -1.2% | 0.35% |
| 2074 | -1.2% | 0.44% |
| 2073 | -1.18% | 0.45% |
| 2072 | -1.17% | 0.47% |
| 2071 | -1.15% | 0.51% |
| 2070 | -1.14% | 0.53% |
| 2069 | -1.12% | 0.59% |
| 2068 | -1.1% | 0.64% |
| 2067 | -1.08% | 0.65% |
| 2066 | -1.06% | 0.66% |
| 2065 | -1.04% | 0.66% |
| 2064 | -1.01% | 0.67% |
| 2063 | -0.99% | 0.77% |
| 2062 | -0.97% | 0.73% |
| 2061 | -0.94% | 0.79% |
| 2060 | -0.92% | 0.79% |
| 2059 | -0.9% | 0.84% |
| 2058 | -0.88% | 0.86% |
| 2057 | -0.86% | 0.9% |
| 2056 | -0.85% | 0.95% |
| 2055 | -0.83% | 0.93% |
| 2054 | -0.81% | 1.01% |
| 2053 | -0.79% | 1.06% |
| 2052 | -0.78% | 1.12% |
| 2051 | -0.76% | 1.12% |
| 2050 | -0.75% | 1.11% |
| 2049 | -0.73% | 1.19% |
| 2048 | -0.72% | 1.16% |
| 2047 | -0.71% | 1.26% |
| 2046 | -0.69% | 1.28% |
| 2045 | -0.68% | 1.37% |
| 2044 | -0.67% | 1.35% |
| 2043 | -0.66% | 1.37% |
| 2042 | -0.64% | 1.44% |
| 2041 | -0.63% | 1.5% |
| 2040 | -0.62% | 1.5% |
| 2039 | -0.6% | 1.47% |
| 2038 | -0.59% | 1.54% |
| 2037 | -0.58% | 1.59% |
| 2036 | -0.56% | 1.65% |
| 2035 | -0.54% | 1.65% |
| 2034 | -0.53% | 1.69% |
| 2033 | -0.51% | 1.78% |
| 2032 | -0.5% | 1.81% |
| 2031 | -0.47% | 1.81% |
| 2030 | -0.46% | 1.85% |
| 2029 | -0.43% | 1.83% |
| 2028 | -0.4% | 1.97% |
| 2027 | -0.38% | 1.98% |
| 2026 | -1.18% | 2.03% |
| 2025 | -0.34% | 2.06% |
| 2024 | -0.35% | 2.15% |
| 2023 | -0.36% | 2.22% |
| 2022 | -0.43% | 2.25% |
| 2021 | -1.42% | 2.3% |
| 2020 | -1.18% | 2.34% |
| 2019 | -0.02% | 2.35% |
| 2018 | -0% | 2.38% |
| 2017 | 0.01% | 2.41% |
| 2016 | -0.04% | 2.38% |
| 2015 | -0.07% | 2.35% |
| 2014 | -0.07% | 2.42% |
| 2013 | -0.06% | 2.49% |
| 2012 | -0% | 2.56% |
| 2011 | 0.05% | 2.64% |
| 2010 | -0.29% | 2.76% |
| 2009 | 0.07% | 2.73% |
| 2008 | 0.01% | 2.53% |
| 2007 | -0.05% | 2.22% |
| 2006 | -0.06% | 2.23% |
| 2005 | -0.04% | 2.73% |
| 2004 | -0.06% | 3.44% |
| 2003 | -0.07% | 4.15% |
| 2002 | -0.05% | 5.94% |
| 2001 | -0.03% | 6.08% |
| 2000 | -1.04% | 2.44% |
| 1999 | -0.008% | 0.52% |
| 1998 | 0.04% | 0.99% |
| 1997 | 0.07% | 1.3% |
| 1996 | 0.08% | 0.48% |
| 1995 | 0.14% | 0.15% |
| 1994 | 0.21% | 0.38% |
| 1993 | 0.25% | -0.22% |
| 1992 | 0.31% | -1.88% |
| 1991 | 0.36% | 1.18% |
| 1990 | 0.39% | 4.04% |
| 1989 | 0.36% | 2.53% |
| 1988 | 0.42% | 2.74% |
| 1987 | 0.57% | 2.72% |
| 1986 | 0.68% | 2.47% |
| 1985 | 0.81% | 2.24% |
| 1984 | 0.91% | 2.21% |
| 1983 | 0.94% | 2.16% |
| 1982 | 0.92% | 2.07% |
| 1981 | 0.91% | 2.04% |
| 1980 | 0.93% | 2.01% |
| 1979 | 0.81% | 1.97% |
| 1978 | 0.8% | 1.95% |
| 1977 | 0.97% | 1.87% |
| 1976 | 1% | 1.82% |
| 1975 | 1% | 1.86% |
| 1974 | 0.96% | 1.87% |
| 1973 | 0.91% | 1.87% |
| 1972 | 0.83% | 1.85% |
| 1971 | 0.36% | 1.88% |
| 1970 | 0.36% | 1.91% |
| 1969 | 0.79% | 1.91% |
| 1968 | 0.96% | 1.92% |
| 1967 | 0.97% | 1.9% |
| 1966 | 0.75% | 1.86% |
| 1965 | 0.98% | 1.83% |
| 1964 | 1.39% | 1.77% |
| 1963 | 1.33% | 1.71% |
| 1962 | 1.15% | 1.65% |
| 1961 | 1.1% | 1.58% |
Data sources: United Nations | World Population Prospects (2026–2100, retrieved 2026-07-08); World Bank | Health (1961–2025, retrieved 2026-07-08).
GeoRank.org/population/poland/sierra-leone | CC BY
In 2025, the population of Poland declined by 0.34%, while Sierra Leone's population grew by 2.06%.
Live population counters
|
Poland
|
Sierra Leone
|
|
|---|---|---|
| Current population |
36007074
|
9090531
|
| Population rank | 47/197 | 100/197 |
| Percent of world population | 0.43% | 0.11% |
| One net population change |
4.27 minutes
|
2.96 minutes
|
| One birth every |
2.08 minutes
|
2.02 minutes
|
| One death every |
1.28 minutes
|
7.41 minutes
|
| Daily growth/decline | -338 | +487 |
| Annual growth/decline | -123,372 | +177,772 |
| Annual growth/decline rate | -0.34% | +2.06% |
| Population growth rate rank | 179/197 | 47/197 |
| One migration net change every |
1.59 minutes
|
46.6 minutes
|
| Annual migration change | -330,820 | -11,309 |
| Net migration rank | 191/196 | 136/196 |
| Foreign-born residents | 1,739,901 | 49,997 |
| Foreign-born residents rank | 41/195 | 151/195 |
| Foreign-born share of population | 4.5% | 0.6% |
| Foreign-born share rank | 97/195 | 174/195 |
Natural population change vs migration
| Year | Population change | |||
|---|---|---|---|---|
|
Poland
|
Sierra Leone
|
|||
| Natural | Migration | Natural | Migration | |
| 2025 | - | -330,820 | - | -11,309 |
| 2024 | -157,205 | -238,062 | 189,234 | -11,000 |
| 2023 | -135,743 | -7,824 | 188,788 | -4,000 |
| 2022 | -143,605 | 967,744 | 186,625 | -4,000 |
| 2021 | -184,907 | 2,251 | 183,326 | -1,544 |
| 2020 | -120,050 | 3,920 | 181,015 | 1,292 |
| 2019 | -34,169 | 7,696 | 181,068 | -2,238 |
| 2018 | -26,582 | -223 | 178,772 | -2,741 |
| 2017 | 0 | -21,535 | 173,259 | 1,234 |
| 2016 | -3,797 | -5,675 | 168,784 | 4,657 |
| 2015 | -26,590 | 3,887 | 162,275 | -356 |
| 2014 | 0 | 5,525 | 160,137 | 485 |
| 2013 | -19,020 | 12,402 | 161,265 | 2,773 |
| 2012 | 0 | 4,635 | 160,915 | 988 |
| 2011 | 11,419 | 45,951 | 158,858 | 6,895 |
| 2010 | 38,043 | 119,623 | 155,338 | 7,983 |
| 2009 | 30,521 | -8,283 | 152,669 | 18,145 |
| 2008 | 34,313 | -42,288 | 149,855 | 1,182 |
| 2007 | 11,436 | -51,235 | 145,740 | -6,042 |
| 2006 | 3,814 | -68,882 | 144,127 | -34,052 |
| 2005 | -3,817 | -41,942 | 137,234 | -1,805 |
| 2004 | -7,637 | -38,216 | 132,661 | 23,897 |
| 2003 | -15,281 | -19,039 | 130,312 | 69,185 |
| 2002 | -3,823 | -16,462 | 126,429 | 86,578 |
| 2001 | 3,825 | -16,648 | 116,647 | 227,791 |
| 2000 | 11,478 | -15,921 | 110,754 | 83,013 |
| 1999 | 0 | -53,035 | 102,295 | -84,926 |
| 1998 | 19,332 | -39,509 | 103,906 | -76,766 |
| 1997 | 34,785 | -44,230 | 105,433 | -48,437 |
| 1996 | 42,487 | -45,349 | 104,140 | -52,110 |
| 1995 | 46,314 | -52,989 | 100,885 | -112,857 |
| 1994 | 96,357 | -41,845 | 101,486 | -77,371 |
| 1993 | 103,846 | -48,805 | 103,317 | -95,476 |
| 1992 | 118,928 | -46,893 | 103,251 | -129,565 |
| 1991 | 141,511 | -55,342 | 105,477 | -238,965 |
| 1990 | 160,066 | -50,339 | 100,778 | 131,587 |
| 1989 | 182,215 | -49,192 | 98,298 | -5,079 |
| 1988 | 215,599 | -101,671 | 96,344 | 9,470 |
| 1987 | 226,008 | -32,310 | 94,235 | 9,558 |
| 1986 | 258,448 | -22,520 | 90,902 | 7,992 |
| 1985 | 297,615 | -27,277 | 88,869 | -7,873 |
| 1984 | 332,137 | -18,402 | 87,072 | -8,708 |
| 1983 | 373,032 | -26,724 | 84,628 | -8,783 |
| 1982 | 369,551 | -34,980 | 82,457 | -11,379 |
| 1981 | 351,806 | -16,155 | 80,111 | -12,699 |
| 1980 | 348,627 | -42,420 | 77,932 | -11,641 |
| 1979 | 366,571 | -22,162 | 75,992 | -13,095 |
| 1978 | 339,166 | -62,936 | 74,130 | -13,073 |
| 1977 | 353,828 | -33,496 | 71,663 | -12,399 |
| 1976 | 367,612 | -25,716 | 69,506 | -15,686 |
| 1975 | 350,356 | -31,346 | 67,560 | -13,058 |
| 1974 | 346,893 | -18,273 | 65,357 | -11,473 |
| 1973 | 320,229 | -29,335 | 62,443 | -9,322 |
| 1972 | 314,028 | -15,004 | 60,279 | -8,267 |
| 1971 | 278,660 | -31,767 | 58,484 | -8,162 |
| 1970 | 280,913 | -66,859 | 56,513 | -4,957 |
| 1969 | 270,151 | -26,744 | 54,768 | -4,485 |
| 1968 | 280,963 | -11,905 | 53,126 | -3,743 |
| 1967 | 275,089 | -25,479 | 51,734 | -2,819 |
| 1966 | 297,801 | -17,158 | 49,486 | -2,911 |
| 1965 | 314,450 | -21,658 | 47,223 | -1,851 |
| 1964 | 326,965 | -23,273 | 45,487 | -2,308 |
| 1963 | 359,330 | -13,770 | 43,569 | -2,480 |
| 1962 | 360,671 | -31,021 | 41,603 | -2,658 |
| 1961 | 398,521 | -20,044 | 40,022 | -2,947 |
| 1960 | 444,562 | -6,306 | 38,192 | -3,528 |
Data sources: World Bank | Health (1960–2025, retrieved 2026-07-08).
GeoRank.org/population/poland/sierra-leone | CC BY
Over the last 10 years, 53.9% of the population change in Poland is from natural causes (a loss of 832,648 people) and 46.1% is from migration (a gain of 712,179 people). In Sierra Leone 99% is from natural causes (a gain of 1,793,146 people) and 1.03% is from migration (a loss of 18,696 people).
As of 2024, 1,739,901 residents or 4.5% of the population were not native-born in Poland, compared to 49,997 people or 0.6% in Sierra Leone.
Biggest cities by population
|
Poland
|
|
|---|---|
| City | Population |
| Warsaw | 1.86M |
| Krakow | 804K |
| Wroclaw | 674K |
| Lodz | 649K |
| Poznan | 547K |
| Gdansk | 488K |
| Szczecin | 388K |
| Lublin | 335K |
| Bydgoszcz | 325K |
| Bialystok | 290K |
|
Sierra Leone
|
|
|---|---|
| City | Population |
| Freetown | 951K |
| Bo | 234K |
| Kenema | 188K |
Compare countries by 7 more topics
Population differences between Poland and Sierra Leone
|
Poland
|
Sierra Leone
|
|
|---|---|---|
| Life expectancy | 79.2 years | 62.3 years |
| Average age | 43.1 years | 24.6 years |
| Median age | 43.5 years | 20.7 years |
| Male:Female ratio | 48.4:51.6 | 49.9:50.1 |
| Fertility rate | 1.14 births per woman | 3.7 births per woman |
| Population density | 304 ppl/mi² | 323 ppl/mi² |
Population map with other countries
Data sources: World Bank | Health (1960–2025, retrieved 2026-07-08); United Nations | World Population Prospects (1960–2026, retrieved 2026-07-08); U.S. Census Bureau (1960–2025, retrieved 2026-07-08); Central Intelligence Agency (CIA) (2000–2019, retrieved 2026-07-08).
GeoRank.org/population/poland/sierra-leone | CC BY
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Data sources:
- World Bank | Health (1960–2025, retrieved 2026-07-08)
- United Nations | World Population Prospects (1960–2100, retrieved 2026-07-08)
- U.S. Census Bureau (1960–2025, retrieved 2026-07-08)
- Central Intelligence Agency (CIA) (2000–2019, retrieved 2026-07-08)
- Wikidata (2026, retrieved 2026-07-08)
Creative Commons Attribution (CC BY) — you’re free to copy, share, remix, adapt, and use even commercially as long as you give appropriate credit and clearly indicate if you made changes. Other sources may be subject to different license terms.