About This Place
South Dennis is a census-designated place (CDP) in the town of Dennis in Barnstable County, Massachusetts, United States. The population was 3,679 at the 2000 census.
South Dennis is located at 41°42′21″N 70°9′45″W / 41.70583°N 70.1625°W / 41.70583; -70.1625.
According to the United States Census Bureau, the CDP has a total area of 12.3 km² (4.7 mi²). 11.8 km² (4.6 mi²) of it is land and 0.5 km² (0.2 mi²) of it (4.01%) is water.