South Norwalk is a neighborhood and the Second Taxing District in Norwalk, Connecticut. The neighborhood was originally a settlement called 'Old Well' which became chartered as the city of 'South Norwalk' on August 18, 1870. The cities of Norwalk and South Norwalk were incorporated on June 6, 1913. Often referred to with the acronym 'SoNo' (redeveloped area). "The term 'SoNo' refers to the formerly rundown stretch of Washington Street between the Metro-North Railroad tracks and Norwalk Harbor".