Built in the 1840s
William Henry Harrison died a month into his term in 1841 and John Tyler served the rest, then James K. Polk from 1845 and Zachary Taylor from 1849. Texas was annexed in 1845 and the war with Mexico ran from 1846 to 1848. Gold was found in California in 1848. Famine in Ireland began a migration that reshaped the eastern cities.
550 places on the National Register have a construction year in the 1840s on record. They stand in 42 states and territories. 24 are National Historic Landmarks.
Construction years come from Wikidata, matched on National Register reference number. Only plain four-digit years are counted, so a place recorded as circa or as a range is left out. Data refreshed September 19, 2026.
By state
Longest-lived styles of the decade
| Style | In the 1840s | Dated examples, all decades | Years in use |
|---|---|---|---|
| Neoclassical | 7 | 1023 | 1680 to 2016 |
| Greek Revival | 260 | 1093 | 1660 to 1987 |
| Vernacular | 6 | 182 | 1662 to 1984 |
| Georgian | 2 | 192 | 1666 to 1986 |
| Gothic Revival | 36 | 753 | 1702 to 2017 |
| Renaissance Revival | 9 | 482 | 1712 to 2015 |
| Colonial Revival | 2 | 797 | 1701 to 1998 |
| Federal | 32 | 599 | 1700 to 1996 |
Style labels come from Wikidata. A style is ranked by the span between the earliest and latest dated listing that carries it, across the whole register, and only styles with two or more listings in this decade are shown. Data refreshed September 19, 2026.
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Places with full records
The other 526 listings from this decade are on the state pages above and on their county pages.