Houses completed in 1780

John Wolf Kemp House was a historic home located at Colonie in Albany County, New York. It was built about 1780 and was a 2-story, L-shaped frame farmhouse with a gable roof and five bays wide. It had a 1+1⁄2-story rear ell. It featured a 1-story hip-roofed enclosed porch over the three central bays. The entrance and side parlors have Federal-style details. Also on the property were a contributing privy and summer kitchen. The house was demolished in May 2003.

The Holdrum–Van Houten House is located at 43 Spring Valley Road in the borough of Montvale in Bergen County, New Jersey, United States. The historic stone house was built from 1778 to around 1780 and was added to the National Register of Historic Places on January 9, 1983, for its significance in architecture. It was listed as part of the Early Stone Houses of Bergen County Multiple Property Submission (MPS).

The Captain Philo Beardsley House is a historic house on Beardsley Road in Kent, Connecticut. Built about 1780, it is a well-preserved example of an 18th-century saltbox, with a remarkably well-preserved interior. It was listed on the National Register of Historic Places in 1979.

House at 352 Piermont Avenue is a historic home located at Piermont, Rockland County, New York. It was built about 1780, and is a 2+1⁄2-story, side-gabled, sandstone Colonial period residence. A two-story frame addition was built about 1970. The house features a two-story, full-facade replacement porch.

The Woodruff House is a historic house at 377 Berlin Street in Southington, Connecticut. Built about 1780, it is a well-preserved example of an 18th-century Cape with later Greek Revival styling. It was listed on the National Register of Historic Places in 1989.

The Townsend Farm is a historic farmstead on East Harrisville Road in Dublin, New Hampshire. The property was developed in several stages, beginning with the construction of a modest, 1-1/2 story Cape style structure in c. 1780 by Abel Wilder. The main block of the farmhouse, to which the older structure is attached as an ell, was built c. 1850 by Jonathan Townsend; it is a 2-1/2 story Greek Revival structure. The property was acquire c. 1890 by the artist George DeForest Brush, who adapted it for use as his principal studio. Brush was a leading figure in Dublin's art colony, playing host to other artists and luminaries of the art world, including Isabella Stewart Gardner.

Mountain View Farm is a historic farmhouse on Close Road, off Upper Jaffrey Road in Dublin, New Hampshire. The house consists of two parts. The older portion is a two-story wood frame structure built about 1780 by Nathan Bixby, a major landowner and prominent citizen of the town. In the late 19th century the house was acquired by George and Alice Upton, who in 1903 commissioned John Lawrence Mauran, a prominent Chicago architect, to design a Georgian Revival summer house, to which the older house was attached as a wing. The best-known occupant of the house was Mark Twain, who rented it for his second visit to Dublin in 1906.

Timothy Cummins House is a historic home located near Smyrna, Kent County, Delaware. It built about 1780, and is a two-story, five-bay center hall plan brick dwelling in the Georgian style. It has a small 1+1⁄2-story kitchen wing. A Greek Revival-style porch was added in the second quarter of the 19th century.

Fisher's Paradise, also known as Paradise Point , is a historic home located near Lewes, Sussex County, Delaware. The main house dates to about 1780, and is a 2+1⁄2-story, three-bay, wood frame dwelling sheathed in cedar shingles. It has gable roof with dormers. The kitchen wing is the sole remaining portion of the original 1740s house that is incorporated in the present structure.

Sehner-Ellicott-Von Hess House is a historic home located at 123 N. Prince Street, Lancaster, Pennsylvania. It was built about 1780 by George Sehner, and is a finely restored house built in the Georgian style of architecture. It was occupied by Andrew Ellicott (1754–1820), first United States Surveyor General, from 1801 to 1813. Ellicott helped prepare Captain Meriwether Lewis for his exploration of the Louisiana Purchase.