1804

Centuries:	18th century 19th century 20th century
Decades:	1780s 1790s 1800s 1810s 1820s
Years:	1801 1802 1803 1804 1805 1806 1807
Categories:	Births - Deaths Establishments - Publications
Media:	1804 (Events)

1804 was a leap year of the Gregorian calendar and a leap year of the Julian calendar, the 1804th year of the Common Era (CE), the 4th year of the 19th century, and the 5th year of the 1800s decade. As of the start of 1804, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.