|Centuries:||19th century - 20th century|
|Decades:||1790s 1800s 1810s - 1820s - 1830s 1840s 1850s|
|Years:||1820 1821 1822 1823 1824 1825 1826 1827 1828 1829|
- March 20 - South Bainbridge, New York. Joseph Smith was tried and acquitted by Justice of the Peace Albert Neely Jr. of a charge of being a disorderly person.
- November 2 - Hyrum Smith and Jerusha Barden married.