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|Millennia:||3rd millennium · 4th millennium · 5th millennium|
|Centuries:||31st century · 32nd century · 33rd century · 34th century · 35th century · 36th century · 37th century · 38th century · 39th century · 40th century|
The fourth millennium is the millennium that will start on January 1, 3001 and will end on December 31, 4000 of the Gregorian calendar.