| Millennium: | 2nd millennium |
| Centuries: | 18th century – 19th century – 20th century |
| Decades: | 1790s 1800s 1810s – 1820s – 1830s 1840s 1850s |
| Years: | 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 1820s decade ran from January 1, 1820, to December 31, 1829.
| Millennium: | 2nd millennium |
| Centuries: | 18th century – 19th century – 20th century |
| Decades: | 1790s 1800s 1810s – 1820s – 1830s 1840s 1850s |
| Years: | 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
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