West Dennis is a census-designated place (CDP) in the town of Dennis in Barnstable County, Massachusetts, United States. The population was 2,242 at the 2010 census.
West Dennis is located in the southwest corner of the town of Dennis at 41°39′42″N 70°9′43″W (41.661753, -70.161975). It is bordered to the north by the CDP of South Dennis, to the east by Dennis Port, to the south by Nantucket Sound, and to the west by South Yarmouth.
According to the United States Census Bureau, the West Dennis CDP has a total area of 4.2 square miles (10.9 km2). 3.3 square miles (8.5 km2) of it is land, and 0.97 square miles (2.5 km2) of it (22.50%) is water.
The Ezra H. Baker Elementary School, named for Ezra Henry Baker, is found in West Dennis.
As of the census of 2000, there were 2,570 people, 1,279 households, and 698 families residing in the CDP. The population density was 301.6/km2 (781.3/mi2). There were 2,733 housing units at an average density of 320.7/km2 (830.8/mi2). The racial makeup of the CDP was 95.53% White, 2.37% African American, 0.54% Native American, 0.31% Asian, 0.43% from other races, and 0.82% from two or more races. Hispanic or Latino of any race were 0.93% of the population.
There were 1,279 households, out of which 13.0% had children under the age of 18 living with them, 44.0% were married couples living together, 7.3% had a female householder with no husband present, and 45.4% were non-families.