“THE OLDEST HOUSE IN U.S.A.”, Santa Fe, New Mexico. This house, across the lane from San Miguel Mission is built of puddled adobe and is believed to be pre-Spanish, built in circa 1200 A.D. in the Pueblo of Analco. This house is the last remnant of that Pueblo that occupied much of the area on the south side of the Santa Fe River.
UPDATE (03/2026): Called the De Vargas Street House now, This claim is now widely disputed, with other websites including SWD citing that it was built around 1643, but with it foundations dating back to 1200. Older, continuously inhabited structures have also been found to exist, such as the Taos Pueblo and Acoma Pueblo, which date back to roughly 1000–1200 AD.