San Mar, MD Demographics

A map of San Mar's Population by Race

San Mar, Maryland has an estimated population of 306, a large decrease from the 366 recorded in the 2020 Census. The population is 91.5% White, 6.9% Black, 1.6% Hispanic, 0.0% Asian, 0.0% Native American/Other, and 0.0% Multiracial. This demographic dot map shows the population of San Mar, with one dot drawn for each person counted by the Census, color-coded by race.

San Mar has become considerably more racially diverse since the 2020 Census. It is considerably less diverse than Maryland overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In San Mar, that probability was 8.0% in 2020 and 15.8% in the most recent ACS estimates.

San Mar is ranked the 420th most populous place in Maryland, out of 536 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). San Mar was ranked the 409th most populous place in the 2020 Census.

San Mar's White Population

280 residents of San Mar, or 91.5% of the population, identify as White. The share of White residents in San Mar is significantly higher than in Maryland overall, where 46.6% of the population is White. San Mar ranks 19th statewide in terms of White residents as a share of the population, out of 536 places.

Since the 2020 Census, San Mar's White population has declined by an estimated 20.2%. White residents' share of San Mar's population has decreased from 95.9% to 91.5%.

San Mar is more White than neighboring Mount Lena (85.9% White), Beaver Creek (57.9% White), and Bagtown (74.8% White). San Mar is less White than neighboring Mapleville (95.3% White), and Boonsboro (94.3% White).

San Mar's Black Population

21 residents of San Mar, or 6.9% of the population, identify as Black. The share of Black residents in San Mar is significantly lower than in Maryland overall, where 28.9% of the population is Black. San Mar ranks 469th statewide in terms of Black residents as a share of the population, out of 536 places.

Since the 2020 Census, San Mar's Black population has grown by an estimated 950.0%. Black residents' share of San Mar's population has increased from 0.5% to 6.9%.

San Mar is more Black than neighboring Mapleville (0% Black), Mount Lena (0% Black), Bagtown (0% Black), and Boonsboro (2.4% Black). San Mar is less Black than neighboring Beaver Creek (24.4% Black).

San Mar's Asian Population

0 residents of San Mar, or 0.0% of the population, identify as Asian. The share of Asian residents in San Mar is lower than in Maryland overall, where 6.5% of the population is Asian. San Mar ranks 319th statewide in terms of Asian residents as a share of the population, out of 536 places.

Since the 2020 Census, San Mar's Asian population has declined by an estimated 100.0%. Asian residents' share of San Mar's population has decreased from 1.1% to 0.0%.

San Mar is less Asian than neighboring Mapleville (4.7% Asian), Beaver Creek (11.2% Asian), and Boonsboro (1.1% Asian).

San Mar's Hispanic Population

5 residents of San Mar, or 1.6% of the population, identify as Hispanic. The share of Hispanic residents in San Mar is considerably lower than in Maryland overall, where 12.5% of the population is Hispanic. San Mar ranks 513th statewide in terms of Hispanic residents as a share of the population, out of 536 places.

Since the 2020 Census, San Mar's Hispanic population has grown by an estimated 150.0%. Hispanic residents' share of San Mar's population has increased from 0.5% to 1.6%.

San Mar is more Hispanic than neighboring Mapleville (0% Hispanic), Beaver Creek (0% Hispanic), and Boonsboro (1.3% Hispanic). San Mar is less Hispanic than neighboring Mount Lena (13% Hispanic), and Bagtown (19.7% Hispanic).

San Mar's Native American/Other Population

0 residents of San Mar, or 0.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in San Mar is comparable to the share in Maryland overall, where 0.8% of the population is Native American/Other. San Mar ranks 344th statewide in terms of Native American/Other residents as a share of the population, out of 536 places.

Since the 2020 Census, San Mar's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of San Mar's population has decreased from 0.5% to 0.0%.

San Mar is less Native American/Other than neighboring Mount Lena (0.5% Native American/Other).

San Mar's Multiracial Population

0 residents of San Mar, or 0.0% of the population, identify as Multiracial. The share of Multiracial residents in San Mar is slightly lower than in Maryland overall, where 4.6% of the population is Multiracial. San Mar ranks 507th statewide in terms of Multiracial residents as a share of the population, out of 536 places.

Since the 2020 Census, San Mar's Multiracial population has declined by an estimated 100.0%. Multiracial residents' share of San Mar's population has decreased from 1.4% to 0.0%.

San Mar is less Multiracial than neighboring Mount Lena (0.5% Multiracial), Beaver Creek (6.6% Multiracial), Bagtown (5.5% Multiracial), and Boonsboro (0.9% 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.