The 1900s was a decade. The term is also used to refer to the period between 1900 and 1999, which is almost synonymous with the 20th century (1901 to 2000). Years 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 Categories: Decades Community content is available under CC-BY-SA unless otherwise noted.