South Dennis, MA Demographics

A map of South Dennis's Population by Race

South Dennis, Massachusetts has an estimated population of 3,135, a large decrease from the 3,899 recorded in the 2020 Census. The population is 91.4% White, 4.7% Black, 3.0% Native American/Other, 0.5% Asian, 0.4% Hispanic, and 0.0% Multiracial. This demographic dot map shows the population of South Dennis, with one dot drawn for each person counted by the Census, color-coded by race.

South Dennis has become considerably less racially diverse since the 2020 Census. It is considerably less diverse than Massachusetts overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In South Dennis, that probability was 24.9% in 2020 and 16.2% in the most recent ACS estimates.

South Dennis is ranked the 154th most populous place in Massachusetts, out of 248 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). South Dennis was ranked the 139th most populous place in the 2020 Census.

South Dennis's White Population

2,864 residents of South Dennis, or 91.4% of the population, identify as White. The share of White residents in South Dennis is significantly higher than in Massachusetts overall, where 66.6% of the population is White. South Dennis ranks 109th statewide in terms of White residents as a share of the population, out of 248 places.

Since the 2020 Census, South Dennis's White population has declined by an estimated 14.9%. White residents' share of South Dennis's population has increased from 86.4% to 91.4%.

South Dennis is more White than neighboring Dennis Port (78.3% White), West Dennis (73.6% White), Northwest Harwich (86.7% White), and Dennis (90.8% White). South Dennis is less White than neighboring East Dennis (96.4% White).

South Dennis's Black Population

148 residents of South Dennis, or 4.7% of the population, identify as Black. The share of Black residents in South Dennis is comparable to the share in Massachusetts overall, where 6.4% of the population is Black. South Dennis ranks 52nd statewide in terms of Black residents as a share of the population, out of 248 places.

Since the 2020 Census, South Dennis's Black population has declined by an estimated 12.9%. Black residents' share of South Dennis's population has remained roughly unchanged at 4.7%.

South Dennis is more Black than neighboring East Dennis (0% Black), Dennis Port (3.5% Black), West Dennis (2.2% Black), Northwest Harwich (0% Black), and Dennis (0% Black).

South Dennis's Asian Population

17 residents of South Dennis, or 0.5% of the population, identify as Asian. The share of Asian residents in South Dennis is lower than in Massachusetts overall, where 7.3% of the population is Asian. South Dennis ranks 223rd statewide in terms of Asian residents as a share of the population, out of 248 places.

Since the 2020 Census, South Dennis's Asian population has declined by an estimated 15.0%. Asian residents' share of South Dennis's population has remained roughly unchanged at 0.5%.

South Dennis is more Asian than neighboring East Dennis (0% Asian), West Dennis (0% Asian), and Dennis (0% Asian). South Dennis is less Asian than neighboring Dennis Port (1% Asian), and Northwest Harwich (0.6% Asian).

South Dennis's Hispanic Population

13 residents of South Dennis, or 0.4% of the population, identify as Hispanic. The share of Hispanic residents in South Dennis is considerably lower than in Massachusetts overall, where 13.3% of the population is Hispanic. South Dennis ranks 182nd statewide in terms of Hispanic residents as a share of the population, out of 248 places.

Since the 2020 Census, South Dennis's Hispanic population has declined by an estimated 88.9%. Hispanic residents' share of South Dennis's population has decreased from 3.0% to 0.4%.

South Dennis is less Hispanic than neighboring Dennis Port (8.9% Hispanic), West Dennis (22.8% Hispanic), Northwest Harwich (2.7% Hispanic), and Dennis (8.5% Hispanic).

South Dennis's Native American/Other Population

93 residents of South Dennis, or 3.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in South Dennis is comparable to the share in Massachusetts overall, where 1.3% of the population is Native American/Other. South Dennis ranks 61st statewide in terms of Native American/Other residents as a share of the population, out of 248 places.

Since the 2020 Census, South Dennis's Native American/Other population has grown by an estimated 69.1%. Native American/Other residents' share of South Dennis's population has increased from 1.4% to 3.0%.

South Dennis is more Native American/Other than neighboring East Dennis (0% Native American/Other), Dennis Port (2.6% Native American/Other), West Dennis (0.6% Native American/Other), Northwest Harwich (2.6% Native American/Other), and Dennis (0% Native American/Other).

South Dennis's Multiracial Population

0 residents of South Dennis, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in South Dennis is lower than in Massachusetts overall, where 5.1% of the population is Multiracial. South Dennis ranks 100th statewide in terms of Multiracial residents as a share of the population, out of 248 places.

Since the 2020 Census, South Dennis's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of South Dennis's population has decreased from 4.4% to 0.0%.

South Dennis is less Multiracial than neighboring East Dennis (3.1% Multiracial), Dennis Port (5.6% Multiracial), West Dennis (0.7% Multiracial), Northwest Harwich (7.3% Multiracial), and Dennis (0.7% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.