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Population in Sierra Leone compared to Slovenia: Trends, Charts, Rankings

Updated on by Georank

The latest officially reported population of Sierra Leone was 8,819,794 in 2025 vs 2,130,986 people in Slovenia in 2025. In 2026, based on the adjusted UN estimation, the current Sierra Leone's population is 9,090,531 people compared to 2,128,778 in Slovenia.

Population statistics:

  • Sierra Leone's population is 4.27 times bigger than Slovenia's.
  • Sierra Leone is ranked the 100th most populous country in the world, while Slovenia is the 147th.
  • The countries together account for 0.14% of the world: 0.11% for Sierra Leone vs 0.03% for Slovenia.
  • For the last 10 years, Sierra Leone has had an average growth rate of +2.29% per year vs +0.3% in Slovenia.
  • Since 2006, the population of Sierra Leone has increased from 5.62M people to 9.09M (61.6% growth), while Slovenia has grown from 2.01M to 2.13M (6.07% growth).

Sierra Leone vs Slovenia: population by year and forecast

Sierra Leone
Factual

Projection
Slovenia
Factual

Projection
1x
Year Population
Sierra Leone Slovenia
2100 16,107,087 1,644,125
2099 16,121,940 1,648,345
2098 16,135,035 1,652,436
2097 16,149,905 1,656,808
2096 16,160,672 1,661,055
2095 16,169,304 1,665,286
2094 16,168,902 1,669,464
2093 16,173,609 1,673,724
2092 16,170,778 1,677,938
2091 16,163,901 1,682,129
2090 16,154,165 1,686,674
2089 16,142,526 1,691,063
2088 16,128,775 1,695,484
2087 16,112,585 1,700,115
2086 16,085,549 1,705,042
2085 16,064,212 1,709,916
2084 16,040,563 1,714,895
2083 16,006,923 1,720,145
2082 15,970,872 1,725,470
2081 15,930,880 1,731,075
2080 15,892,665 1,737,192
2079 15,850,728 1,743,318
2078 15,801,450 1,749,967
2077 15,750,408 1,756,612
2076 15,695,310 1,763,483
2075 15,635,345 1,770,727
2074 15,580,279 1,778,405
2073 15,512,655 1,786,591
2072 15,442,481 1,794,570
2071 15,370,747 1,802,890
2070 15,293,426 1,811,432
2069 15,212,664 1,820,576
2068 15,124,069 1,829,837
2067 15,028,190 1,838,874
2066 14,931,295 1,848,063
2065 14,833,794 1,857,701
2064 14,736,872 1,867,621
2063 14,638,180 1,877,265
2062 14,525,736 1,886,945
2061 14,420,068 1,896,873
2060 14,307,451 1,907,096
2059 14,194,972 1,917,040
2058 14,077,124 1,926,374
2057 13,957,197 1,936,340
2056 13,832,494 1,945,710
2055 13,702,508 1,955,123
2054 13,576,231 1,964,235
2053 13,440,929 1,972,942
2052 13,299,910 1,981,547
2051 13,152,910 1,989,616
2050 13,006,688 1,997,469
2049 12,863,637 2,004,847
2048 12,712,671 2,011,668
2047 12,566,944 2,018,540
2046 12,411,042 2,025,170
2045 12,254,651 2,031,795
2044 12,088,895 2,038,314
2043 11,928,393 2,044,630
2042 11,767,372 2,050,809
2041 11,599,942 2,056,524
2040 11,428,331 2,061,772
2039 11,259,845 2,067,224
2038 11,097,180 2,072,439
2037 10,928,754 2,078,235
2036 10,757,928 2,083,743
2035 10,582,918 2,089,024
2034 10,411,088 2,093,994
2033 10,238,503 2,099,177
2032 10,059,929 2,104,208
2031 9,881,109 2,109,288
2030 9,705,485 2,114,024
2029 9,529,493 2,118,491
2028 9,358,412 2,122,680
2027 9,177,288 2,125,958
2026 8,998,902 2,128,778
2025 8,819,794 2,130,986
2024 8,642,022 2,127,400
2023 8,460,512 2,120,461
2022 8,276,807 2,112,076
2021 8,094,602 2,108,079
2020 7,912,558 2,102,419
2019 7,731,991 2,088,385
2018 7,554,563 2,073,894
2017 7,379,299 2,066,388
2016 7,205,328 2,065,042
2015 7,037,655 2,063,531
2014 6,876,385 2,061,980
2013 6,714,051 2,059,953
2012 6,551,080 2,057,159
2011 6,387,251 2,052,843
2010 6,222,714 2,048,583
2009 6,055,646 2,039,669
2008 5,894,722 2,021,316
2007 5,749,352 2,018,122
2006 5,624,466 2,006,868
2005 5,501,712 2,000,474
2004 5,355,717 1,997,012
2003 5,177,687 1,995,733
2002 4,971,435 1,994,530
2001 4,692,716 1,992,060
2000 4,423,611 1,988,925
1999 4,318,043 1,983,045
1998 4,295,785 1,981,629
1997 4,253,716 1,985,956
1996 4,199,210 1,988,628
1995 4,179,179 1,989,872
1994 4,173,105 1,989,443
1993 4,157,130 1,991,746
1992 4,166,366 1,996,498
1991 4,246,267 1,999,429
1990 4,196,828 1,998,161
1989 4,034,037 1,996,351
1988 3,934,517 1,995,196
1987 3,829,718 1,989,776
1986 3,728,380 1,965,964
1985 3,638,438 1,941,641
1984 3,558,758 1,932,154
1983 3,481,646 1,922,321
1982 3,408,183 1,910,334
1981 3,338,940 1,906,531
1980 3,272,089 1,901,315
1979 3,207,499 1,882,599
1978 3,145,517 1,862,548
1977 3,085,354 1,842,377
1976 3,028,820 1,820,249
1975 2,974,657 1,793,581
1974 2,920,459 1,776,132
1973 2,866,955 1,766,697
1972 2,814,388 1,752,233
1971 2,763,222 1,738,335
1970 2,712,286 1,724,891
1969 2,661,365 1,713,874
1968 2,611,532 1,704,546
1967 2,562,384 1,689,528
1966 2,514,638 1,669,905
1965 2,468,666 1,649,160
1964 2,424,390 1,632,114
1963 2,382,258 1,616,971
1962 2,342,242 1,603,649
1961 2,304,227 1,594,131
1960 2,268,356 1,584,720

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/sierra-leone/slovenia | CC BY

From 2006 to 2016, the population of Sierra Leone increased by 1,580,862 people (a 28.1% growth), while Slovenia gained 58,174 people (a 2.9% growth).

For the next 10 years, from 2016 to 2026, Sierra Leone gained 1,885,203 people (a 26.2% growth), while Slovenia's population increased by 63,736 people (a 3.09% growth).

Sierra Leone was ranked 105th most populous country in 2006 and is 100th in 2026. Slovenia was ranked 141st in 2006 and ranked 147th now.

The UN's World Population Prospects forecasts that in 24 years (in 2050) Sierra Leone's population will grow by 43.1% to 13,006,688 people with a rank change from 100th to 91st. The population of Slovenia will decrease by 6.17% to 1,997,469 people and will still be ranked 147th.

Sierra Leone is projected to reach its peak in 2093 at 16.2M people, while Slovenia's population already peaked in 2025 at 2.13M people and is projected to decrease to 1.64M people by 2100.

Population growth rate by year

Sierra Leone
Factual

Projection
Slovenia
Factual

Projection
1x
Year Growth rate
Sierra Leone Slovenia
2100 -0.09% -0.26%
2099 -0.08% -0.25%
2098 -0.09% -0.26%
2097 -0.07% -0.26%
2096 -0.05% -0.25%
2095 0.002% -0.25%
2094 -0.03% -0.25%
2093 0.02% -0.25%
2092 0.04% -0.25%
2091 0.06% -0.27%
2090 0.07% -0.26%
2089 0.09% -0.26%
2088 0.1% -0.27%
2087 0.17% -0.29%
2086 0.13% -0.29%
2085 0.15% -0.29%
2084 0.21% -0.31%
2083 0.23% -0.31%
2082 0.25% -0.32%
2081 0.24% -0.35%
2080 0.26% -0.35%
2079 0.31% -0.38%
2078 0.32% -0.38%
2077 0.35% -0.39%
2076 0.38% -0.41%
2075 0.35% -0.43%
2074 0.44% -0.46%
2073 0.45% -0.44%
2072 0.47% -0.46%
2071 0.51% -0.47%
2070 0.53% -0.5%
2069 0.59% -0.51%
2068 0.64% -0.49%
2067 0.65% -0.5%
2066 0.66% -0.52%
2065 0.66% -0.53%
2064 0.67% -0.51%
2063 0.77% -0.51%
2062 0.73% -0.52%
2061 0.79% -0.54%
2060 0.79% -0.52%
2059 0.84% -0.48%
2058 0.86% -0.51%
2057 0.9% -0.48%
2056 0.95% -0.48%
2055 0.93% -0.46%
2054 1.01% -0.44%
2053 1.06% -0.43%
2052 1.12% -0.41%
2051 1.12% -0.39%
2050 1.11% -0.37%
2049 1.19% -0.34%
2048 1.16% -0.34%
2047 1.26% -0.33%
2046 1.28% -0.33%
2045 1.37% -0.32%
2044 1.35% -0.31%
2043 1.37% -0.3%
2042 1.44% -0.28%
2041 1.5% -0.25%
2040 1.5% -0.26%
2039 1.47% -0.25%
2038 1.54% -0.28%
2037 1.59% -0.26%
2036 1.65% -0.25%
2035 1.65% -0.24%
2034 1.69% -0.25%
2033 1.78% -0.24%
2032 1.81% -0.24%
2031 1.81% -0.22%
2030 1.85% -0.21%
2029 1.83% -0.2%
2028 1.97% -0.15%
2027 1.98% -0.13%
2026 2.03% -0.1%
2025 2.06% 0.17%
2024 2.15% 0.33%
2023 2.22% 0.4%
2022 2.25% 0.19%
2021 2.3% 0.27%
2020 2.34% 0.67%
2019 2.35% 0.7%
2018 2.38% 0.36%
2017 2.41% 0.07%
2016 2.38% 0.07%
2015 2.35% 0.08%
2014 2.42% 0.1%
2013 2.49% 0.14%
2012 2.56% 0.21%
2011 2.64% 0.21%
2010 2.76% 0.44%
2009 2.73% 0.91%
2008 2.53% 0.16%
2007 2.22% 0.56%
2006 2.23% 0.32%
2005 2.73% 0.17%
2004 3.44% 0.06%
2003 4.15% 0.06%
2002 5.94% 0.12%
2001 6.08% 0.16%
2000 2.44% 0.3%
1999 0.52% 0.07%
1998 0.99% -0.22%
1997 1.3% -0.13%
1996 0.48% -0.06%
1995 0.15% 0.02%
1994 0.38% -0.12%
1993 -0.22% -0.24%
1992 -1.88% -0.15%
1991 1.18% 0.06%
1990 4.04% 0.09%
1989 2.53% 0.06%
1988 2.74% 0.27%
1987 2.72% 1.21%
1986 2.47% 1.25%
1985 2.24% 0.49%
1984 2.21% 0.51%
1983 2.16% 0.63%
1982 2.07% 0.2%
1981 2.04% 0.27%
1980 2.01% 0.99%
1979 1.97% 1.08%
1978 1.95% 1.09%
1977 1.87% 1.22%
1976 1.82% 1.49%
1975 1.86% 0.98%
1974 1.87% 0.53%
1973 1.87% 0.83%
1972 1.85% 0.8%
1971 1.88% 0.78%
1970 1.91% 0.64%
1969 1.91% 0.55%
1968 1.92% 0.89%
1967 1.9% 1.18%
1966 1.86% 1.26%
1965 1.83% 1.04%
1964 1.77% 0.94%
1963 1.71% 0.83%
1962 1.65% 0.6%
1961 1.58% 0.59%

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/sierra-leone/slovenia | CC BY

In 2025, the population of Sierra Leone grew by 2.06%, while Slovenia's population grew by 0.17%.

Live population counters

Sierra Leone Slovenia
Current population
9090531
2128778
Population rank 100/197 147/197
Percent of world population 0.11% 0.03%
One net population change
2.96 minutes
2.45 hours
One birth every
2.02 minutes
31.3 minutes
One death every
7.41 minutes
24.5 minutes
Daily growth/decline +487 +10
Annual growth/decline +177,772 +3,586
Annual growth/decline rate +2.06% +0.17%
Population growth rate rank 47/197 153/197
One migration net change every
46.6 minutes
3.24 hours
Annual migration change -11,309 +2,711
Net migration rank 136/196 55/196
Foreign-born residents 49,997 315,122
Foreign-born residents rank 151/195 97/195
Foreign-born share of population 0.6% 14.9%
Foreign-born share rank 174/195 44/195

Natural population change vs migration

Sierra Leone
Natural

Migration
Slovenia
Natural

Migration
1x
Year Population change
Sierra Leone Slovenia
Natural Migration Natural Migration
2025 - -11,309 - 2,711
2024 189,234 -11,000 -4,680 3,319
2023 188,788 -4,000 -4,665 5,339
2022 186,625 -4,000 -4,858 9,014
2021 183,326 -1,544 -4,216 2,477
2020 181,015 1,292 -5,256 28,514
2019 181,068 -2,238 -1,254 16,352
2018 178,772 -2,741 -1,037 14,640
2017 173,259 1,234 -207 1,359
2016 168,784 4,657 826 1,195
2015 162,275 -356 826 712
2014 160,137 485 2,268 -70
2013 161,265 2,773 1,648 639
2012 160,915 988 2,674 1,117
2011 158,858 6,895 3,285 2,190
2010 155,338 7,983 3,687 -410
2009 152,669 18,145 3,060 11,594
2008 149,855 1,182 3,437 2,971
2007 145,740 -6,042 1,211 14,191
2006 144,127 -34,052 602 6,081
2005 137,234 -1,805 -600 6,317
2004 132,661 23,897 -599 1,759
2003 130,312 69,185 -1,996 3,218
2002 126,429 86,578 -1,197 1,975
2001 116,647 227,791 -996 4,527
2000 110,754 83,013 -398 3,124
1999 102,295 -84,926 -1,388 10,291
1998 103,906 -76,766 -1,189 -5,280
1997 105,433 -48,437 -794 -1,298
1996 104,140 -52,110 0 -2,456
1995 100,885 -112,857 0 356
1994 101,486 -77,371 199 -153
1993 103,317 -95,476 -199 -4,641
1992 103,251 -129,565 598 -5,547
1991 105,477 -238,965 2,199 -3,325
1990 100,778 131,587 3,797 618
1989 98,298 -5,079 4,592 -2,718
1988 96,344 9,470 5,986 -3,023
1987 94,235 9,558 5,771 2,972
1986 90,902 7,992 6,094 32,700
1985 88,869 -7,873 6,213 3,404
1984 87,072 -8,708 5,990 3,280
1983 84,628 -8,783 6,343 3,613
1982 82,457 -11,379 9,170 -8,695
1981 80,111 -12,699 10,485 -5,016
1980 77,932 -11,641 11,027 3,128
1979 75,992 -13,095 12,614 2,107
1978 74,130 -13,073 11,920 2,113
1977 71,663 -12,399 12,160 2,584
1976 69,506 -15,686 12,196 2,226
1975 67,560 -13,058 11,658 2,421
1974 65,357 -11,473 11,367 3,145
1973 62,443 -9,322 11,837 2,175
1972 60,279 -8,267 10,513 2,924
1971 58,484 -8,162 10,951 2,286
1970 56,513 -4,957 10,004 260
1969 54,768 -4,485 9,427 685
1968 53,126 -3,743 11,250 438
1967 51,734 -2,819 13,516 -192
1966 49,486 -2,911 15,697 -1,262
1965 47,223 -1,851 14,513 -1,421
1964 45,487 -2,308 12,567 -349
1963 43,569 -2,480 14,068 -180
1962 41,603 -2,658 13,150 148
1961 40,022 -2,947 14,985 -306
1960 38,192 -3,528 12,678 -929

Data sources: World Bank | Health (1960–2025, retrieved 2026-07-08).

GeoRank.org/population/sierra-leone/slovenia | CC BY

Over the last 10 years, 99% of the population change in Sierra Leone is from natural causes (a gain of 1,793,146 people) and 1.03% is from migration (a loss of 18,696 people). In Slovenia 22.8% is from natural causes (a loss of 24,521 people) and 77.2% is from migration (a gain of 82,921 people).

As of 2024, 49,997 residents or 0.6% of the population were not native-born in Sierra Leone, compared to 315,122 people or 14.9% in Slovenia.

Biggest cities by population

Sierra Leone
City Population
Freetown 951K
Bo 234K
Kenema 188K
Slovenia
City Population
Ljubljana 284K
Maribor 114K
Kranj 37.6K
Celje 37.1K
Velenje 25.6K
Novo Mesto 24.2K
Nova Gorica 13K
Izola 11.7K
Murska Sobota 11.2K
Piran 3.79K

Compare countries by 7 more topics

Population map with other countries

1x

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/sierra-leone/slovenia | CC BY

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Data sources:

  1. World Bank | Health (1960–2025, retrieved 2026-07-08)
  2. United Nations | World Population Prospects (1960–2100, retrieved 2026-07-08)
  3. U.S. Census Bureau (1960–2025, retrieved 2026-07-08)
  4. Central Intelligence Agency (CIA) (2000–2019, retrieved 2026-07-08)
  5. Wikidata (2026, retrieved 2026-07-08)

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