Built in the 1640s
Civil war in England slowed emigration and left the colonies largely to themselves. Four New England colonies formed a confederation for defense in 1643. Maryland passed its Toleration Act in 1649.
10 places on the National Register have a construction year in the 1640s on record. They stand in 2 states and territories. One is a National Historic Landmark.
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 November 02, 2026.
By state
Longest-lived styles of the decade
| Style | In the 1640s | Dated examples, all decades | Years in use |
|---|---|---|---|
| Colonial | 2 | 136 | 1641 to 1956 |
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 November 02, 2026.
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Places with full records
The other 9 listings from this decade are on the state pages above and on their county pages.