When I read the thread title, I was thinking that this would be about the cities with the highest % of residents that could trace their lineage back to colonial times. That would have been more fun imo.
During a trip to Charleston, our tour guide said that Charleston had the largest collection of 18th Century homes in America. I've never done the research to confirm or refute that claim. Looking at Wiki, it does have a lot of old homes (even if the Wiki lists are incomplete).
https://en.wikipedia.org/wiki/List_o...South_Carolina
St. Andrews Epsicopal Church (1706)
William Rhett House (1712)
Powder Magazine (1713)
John Lining House (1715)
Bullock Buildings (1718)
William Bull House (1720)
Robert Brewton House (1721)
23 King Street (1721)
Thomas Fleming House (1725)
Lambolli's Tenements (1726)
John Cowan House (1729)
Edgar Wells House (1730)
George Chicken House (1731)
William Cleland House (1732)
Peter Fassyoux House (1732)
Thomas Rose House (1733)
Thomas Dale House (1733)
Henry Frost Surgery (1735)
Hext Tenements (1736)
William Elliott House (1737)
Thomas Lamboll House (1739)
William Vanderhorst House (1740)
Clark Mills Studio (1740)
Benjamin Smith House (1740)
George Ducat House (1740)
Alexander Gillon House (1740)
Alexander Peronneau Tenements (1740)
George Sommers House (1740)
Isaac Holmes Tenement (1740)
Anne Boone House (1740)
Othniel Beale House (1740)
Stiles-Henson House (1742)
Brunch-Hall House (1743)
George Eveleigh House (1743)
George Matthews House (1743)
Justinus Stoll House (1745)
John McCall House (1745)
Brewton's Corner (1747)
John Prue House (1746)
Jonathan Badger Tenements (1746)
John Drayton House (1746)
Francis Baker House (1747)
Drayton Hall (1747)
Cabbage Row (1749)
David Ramsay House (1750)
Capers-Motte House (1750)
Daniel Cannon Tenement (1750)
Grimke-Fraser House (circa 1750)
St. Michael's Episcopal Church (1751)
James Veree Houses (1754)
Ralph Izard House (1757)
Mansion House Hotel (1758)
Ann Bocquet House (1758)
Charles Elliott House (1759)
Peter Leger House (1759)
Edward Rutledge House (1760)
Cleland-Wells House (1760)
James Simmons House (1760)
Samuel Wainwright House (1760)
Daniel Elliott Huger House (1760)
Daniel Legare House (1760)
25 Meeting Street (1760)
Cooper-Bee House (1760)
Thomas Elfe House (1760)
Edward Blake House (1760)
Blake Tenements (1760)
Grimke-Fraser Tenements (1760)
Dewar-Lee Pringle House (1762)
John Rutledge House (1763)
Charles Elliott House (1764)
James Veree Houses (1764)
Fotheringham-Mcneil Tenements (1765)
Humphrey Summers House (1765)
Branford-Horry House (1767)
Old St. Michael's Rectory (1767)
McCrady's Tavern (1767)
St. Stephen's Episcopal Church (1767)
Exchange and Provost (1767)
William Washington House (1768)
Miles Brewton House (1769)
Charles Pinckney House (1769)
Young-Keenan House (1769)
John Rose House (1769)
Robert Smith House (1770)
Peter Bocquet, Jr. House (1770)
Simons Tenements (1770)
Young-Motte House (1770)
Albert Detmar House (1770)
Withers-Kaminski House (1770)
John Edwards House (1770)
Young-Johnson House (1770)
James Vanderhorst House (1770)
Heyward-Washington House (1771)
John Scott House (1771)
Geiger House (1771)
John Stuart House (1772)
John Fullerton House (1772)
Unitarian Church (1772)
William Gibbs House (1772)
Philip Porcher House (1773)
Robert Pringle House (1774)
Robert Hayne House (1775)