| Centuries: | 19th century - 20th century |
| Decades: | 1790s 1800s 1810s - 1820s - 1830s 1840s 1850s |
| Years: | 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 |
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Births[]
- July 18 - Lucy Smith, youngest daughter of Joseph Smith Sr. and Lucy Mack Smith, is born.