Southbury is a town in western New Haven County, Connecticut, USA. Southbury is north of Oxford and Newtown, and east of Brookfield. Its population was 18,567 at the 2000 census. Southbury comprises rural country areas, suburban neighborhoods, and historic districts. It is a short distance from major business and commercial centers, and is within 100 miles (160 km) of New York City and 50 miles (80 km) of Hartford; the latter the capital of Connecticut.