How many years of comparable data are there for Sierra Leone and Vietnam?

561 years are reported by both, from 1462 to 2022.

Where does this data come from?

Bastian Becker (2023) – with major processing by Our World in Data, published as Years a country was a European overseas colony. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Sierra Leone vs Vietnam: Years a country was a European overseas colony

Sierra Leone

66 years

in 2022

Vietnam

68 years

in 2022

Sierra Leone rank

92nd

Vietnam rank

90th

Years a country was a European overseas colony over time

Sierra Leone
Vietnam

How they compare

Vietnam currently reports 68 years against 66 years in Sierra Leone, a difference of 2 years.

Across all 561 years both countries report, Vietnam has been ahead every year.

Sierra Leone ranks 92nd and Vietnam ranks 90th of 159 countries.

Vietnam has averaged higher in every one of the 57 decades both report.

Head to head by decade

Decade	Sierra Leone	Vietnam	Difference	Ahead
1460s	0 years	0 years	0 years	—
1470s	0 years	0 years	0 years	—
1480s	0 years	0 years	0 years	—
1490s	0 years	0 years	0 years	—
1500s	0 years	0 years	0 years	—
1510s	0 years	0 years	0 years	—
1520s	0 years	0 years	0 years	—
1530s	0 years	0 years	0 years	—
1540s	0 years	0 years	0 years	—
1550s	0 years	0 years	0 years	—
1560s	0 years	0 years	0 years	—
1570s	0 years	0 years	0 years	—
1580s	0 years	0 years	0 years	—
1590s	0 years	0 years	0 years	—
1600s	0 years	0 years	0 years	—
1610s	0 years	0 years	0 years	—
1620s	0 years	0 years	0 years	—
1630s	0 years	0 years	0 years	—
1640s	0 years	0 years	0 years	—
1650s	0 years	0 years	0 years	—
1660s	0 years	0 years	0 years	—
1670s	0 years	0 years	0 years	—
1680s	0 years	0 years	0 years	—
1690s	0 years	0 years	0 years	—
1700s	0 years	0 years	0 years	—
1710s	0 years	0 years	0 years	—
1720s	0 years	0 years	0 years	—
1730s	0 years	0 years	0 years	—
1740s	0 years	0 years	0 years	—
1750s	0 years	0 years	0 years	—
1760s	0 years	0 years	0 years	—
1770s	0 years	0 years	0 years	—
1780s	0 years	0 years	0 years	—
1790s	0 years	0 years	0 years	—
1800s	0 years	0 years	0 years	—
1810s	0 years	0 years	0 years	—
1820s	0 years	0 years	0 years	—
1830s	0 years	0 years	0 years	—
1840s	0 years	0 years	0 years	—
1850s	0 years	0 years	0 years	—
1860s	0 years	0 years	0 years	—
1870s	0 years	0 years	0 years	—
1880s	0 years	0.6 years	0.6 years	Vietnam
1890s	1 years	8.5 years	7.5 years	Vietnam
1900s	9.5 years	18.5 years	9 years	Vietnam
1910s	19.5 years	28.5 years	9 years	Vietnam
1920s	29.5 years	38.5 years	9 years	Vietnam
1930s	39.5 years	48.5 years	9 years	Vietnam
1940s	49.5 years	58.5 years	9 years	Vietnam
1950s	59.5 years	67 years	7.5 years	Vietnam
1960s	65.9 years	68 years	2.1 years	Vietnam
1970s	66 years	68 years	2 years	Vietnam
1980s	66 years	68 years	2 years	Vietnam
1990s	66 years	68 years	2 years	Vietnam
2000s	66 years	68 years	2 years	Vietnam
2010s	66 years	68 years	2 years	Vietnam
2020s	66 years	68 years	2 years	Vietnam

Averages of every year both report within each decade.

Frequently asked questions

Which has higher years a country was a european overseas colony, Sierra Leone or Vietnam?: Vietnam, at 68 years against 66 years in Sierra Leone as of 2022.
What is the difference in years a country was a european overseas colony between Sierra Leone and Vietnam?: 2 years, with Vietnam ahead.
How many years of comparable data are there for Sierra Leone and Vietnam?: 561 years are reported by both, from 1462 to 2022.
How do Sierra Leone and Vietnam rank globally for years a country was a european overseas colony?: Sierra Leone ranks 92nd and Vietnam ranks 90th of 159 countries.
Where does this data come from?: Bastian Becker (2023) – with major processing by Our World in Data, published as Years a country was a European overseas colony. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Sierra Leone vs Vietnam: Years a country was a European overseas colony. Statizoid, drawing on Bastian Becker (2023) – with major processing by Our World in Data. Retrieved 23 September 2026, from https://reference.statizoid.com/compare/years-colonized/sierra-leone/viet-nam/

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About this data

Indicator: Years a country was a European overseas colony
Unit: years
Source: Bastian Becker (2023) – with major processing by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 159 places, 88,747 data points, 1462–2022
Last refreshed: 18 September 2026

Number of years the country has been colonized from overseas by the European colonial power(s) in a specific year, between Belgium, United Kingdom, France, Germany, Netherlands, Portugal, Spain, and Italy, or a combination of them.