Built in the 1720s
Colonial population roughly doubled over the decade as German and Scots-Irish families arrived through Philadelphia. Baltimore was founded in 1729. Georgian proportions and sash windows were becoming the ordinary way to build a substantial house.
57 places on the National Register have a construction year in the 1720s on record. They stand in 11 states and territories. 2 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 1720s | Dated examples, all decades | Years in use |
|---|---|---|---|
| Georgian | 10 | 192 | 1666 to 1986 |
| Colonial Revival | 2 | 797 | 1701 to 1998 |
| Federal | 4 | 599 | 1700 to 1996 |
| American colonial | 4 | 30 | 1670 to 1913 |
| Colonial | 9 | 119 | 1641 to 1819 |
| Dutch colonial | 2 | 6 | 1720 to 1835 |
| First Period | 16 | 61 | 1641 to 1750 |
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.
Places with full records
The other 55 listings from this decade are on the state pages above and on their county pages.