Isaiah Davenport was an American master builder, prominent in the American city of Savannah, Georgia, during the early 19th century.

Columbia Square is one of the 22 squares of Savannah, Georgia, United States. It is located in the second row of the city's five rows of squares, on Habersham Street and East President Street. It is south of Warren Square and between Oglethorpe Square to the west and Greene Square to the east. The oldest building on the square is at 307 East President Street, today's 17 Hundred 90 Inn, which, as its name suggests, dates to the 18th century.