St. Marys, PA Demographics

A map of St. Marys's Population by Race

St. Marys, Pennsylvania has an estimated population of 12,529, a slight decrease from the 12,738 recorded in the 2020 Census. The population is 93.8% White, 3.1% Multiracial, 1.6% Hispanic, 1.3% Black, 0.2% Asian, and 0.0% Native American/Other. This demographic dot map shows the population of St. Marys, with one dot drawn for each person counted by the Census, color-coded by race.

St. Marys has become more racially diverse since the 2020 Census. It is considerably less diverse than Pennsylvania overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In St. Marys, that probability was 9.0% in 2020 and 11.8% in the most recent ACS estimates.

St. Marys is ranked the 65th most populous place in Pennsylvania, out of 2,002 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). St. Marys was ranked the 64th most populous place in the 2020 Census.

St. Marys's White Population

11,756 residents of St. Marys, or 93.8% of the population, identify as White. The share of White residents in St. Marys is significantly higher than in Pennsylvania overall, where 73% of the population is White. St. Marys ranks 343rd statewide in terms of White residents as a share of the population, out of 2,002 places.

Since the 2020 Census, St. Marys's White population has declined by an estimated 3.2%. White residents' share of St. Marys's population has decreased from 95.4% to 93.8%.

St. Marys is more White than neighboring Johnsonburg (85.6% White). St. Marys is less White than neighboring Kersey (96.1% White), Byrnedale (99.3% White), Weedville (96% White), and Wilcox (100% White).

St. Marys's Black Population

165 residents of St. Marys, or 1.3% of the population, identify as Black. The share of Black residents in St. Marys is lower than in Pennsylvania overall, where 10.3% of the population is Black. St. Marys ranks 1451st statewide in terms of Black residents as a share of the population, out of 2,002 places.

Since the 2020 Census, St. Marys's Black population has grown by an estimated 560.0%. Black residents' share of St. Marys's population has increased from 0.2% to 1.3%.

St. Marys is more Black than neighboring Kersey (0% Black), Johnsonburg (0% Black), Byrnedale (0% Black), Weedville (0% Black), and Wilcox (0% Black).

St. Marys's Asian Population

20 residents of St. Marys, or 0.2% of the population, identify as Asian. The share of Asian residents in St. Marys is slightly lower than in Pennsylvania overall, where 3.8% of the population is Asian. St. Marys ranks 991st statewide in terms of Asian residents as a share of the population, out of 2,002 places.

Since the 2020 Census, St. Marys's Asian population has declined by an estimated 65.5%. Asian residents' share of St. Marys's population has remained roughly unchanged at 0.2%.

St. Marys is more Asian than neighboring Kersey (0% Asian), Byrnedale (0% Asian), Weedville (0% Asian), and Wilcox (0% Asian). St. Marys is less Asian than neighboring Johnsonburg (2% Asian).

St. Marys's Hispanic Population

196 residents of St. Marys, or 1.6% of the population, identify as Hispanic. The share of Hispanic residents in St. Marys is lower than in Pennsylvania overall, where 8.7% of the population is Hispanic. St. Marys ranks 1479th statewide in terms of Hispanic residents as a share of the population, out of 2,002 places.

Since the 2020 Census, St. Marys's Hispanic population has grown by an estimated 58.1%. Hispanic residents' share of St. Marys's population has increased from 1.0% to 1.6%.

St. Marys is more Hispanic than neighboring Kersey (0% Hispanic), Byrnedale (0% Hispanic), Weedville (0% Hispanic), and Wilcox (0% Hispanic).

St. Marys's Native American/Other Population

0 residents of St. Marys, 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 St. Marys is comparable to the share in Pennsylvania overall, where 0.6% of the population is Native American/Other. St. Marys ranks 1112th statewide in terms of Native American/Other residents as a share of the population, out of 2,002 places.

Since the 2020 Census, St. Marys's Native American/Other population has declined by an estimated 100.0%. Native American/Other residents' share of St. Marys's population has remained roughly unchanged at 0.0%.

St. Marys is less Native American/Other than neighboring Johnsonburg (0.2% Native American/Other).

St. Marys's Multiracial Population

392 residents of St. Marys, or 3.1% of the population, identify as Multiracial. The share of Multiracial residents in St. Marys is comparable to the share in Pennsylvania overall, where 3.6% of the population is Multiracial. St. Marys ranks 1272nd statewide in terms of Multiracial residents as a share of the population, out of 2,002 places.

Since the 2020 Census, St. Marys's Multiracial population has grown by an estimated 12.3%. Multiracial residents' share of St. Marys's population has remained roughly unchanged at 3.1%.

St. Marys is more Multiracial than neighboring Byrnedale (0.7% Multiracial), and Wilcox (0% Multiracial). St. Marys is less Multiracial than neighboring Kersey (3.9% Multiracial), Johnsonburg (10.7% Multiracial), and Weedville (4% 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.