St. Marys, IA Demographics

A map of St. Marys's Population by Race

St. Marys, Iowa has an estimated population of 96, a large decrease from the 108 recorded in the 2020 Census. The population is 97.9% White, 2.1% Multiracial, 0.0% Black, 0.0% Asian, 0.0% Hispanic, 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 less racially diverse since the 2020 Census. It is considerably less diverse than Iowa 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 7.2% in 2020 and 4.1% in the most recent ACS estimates.

St. Marys is ranked the 864th most populous place in Iowa, out of 1,026 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 850th most populous place in the 2020 Census.

St. Marys's White Population

94 residents of St. Marys, or 97.9% of the population, identify as White. The share of White residents in St. Marys is significantly higher than in Iowa overall, where 82.3% of the population is White. St. Marys ranks 154th statewide in terms of White residents as a share of the population, out of 1,026 places.

Since the 2020 Census, St. Marys's White population has declined by an estimated 9.6%. White residents' share of St. Marys's population has increased from 96.3% to 97.9%.

St. Marys is more White than neighboring Martensdale (88.9% White), St. Charles (86.5% White), Bevington (80% White), and Spring Hill (87.2% White). St. Marys is less White than neighboring New Virginia (98.1% White).

St. Marys's Black Population

0 residents of St. Marys, or 0.0% of the population, identify as Black. The share of Black residents in St. Marys is slightly lower than in Iowa overall, where 3.8% of the population is Black. St. Marys ranks 600th statewide in terms of Black residents as a share of the population, out of 1,026 places.

Since the 2020 Census, St. Marys's Black population has grown from 0 to an estimated 0. Black residents' share of St. Marys's population has remained roughly unchanged at 0.0%.

St. Marys is less Black than neighboring Martensdale (1.1% Black).

St. Marys's Asian Population

0 residents of St. Marys, or 0.0% of the population, identify as Asian. The share of Asian residents in St. Marys is slightly lower than in Iowa overall, where 2.5% of the population is Asian. St. Marys ranks 543rd statewide in terms of Asian residents as a share of the population, out of 1,026 places.

Since the 2020 Census, St. Marys's Asian population has grown from 0 to an estimated 0. Asian residents' share of St. Marys's population has remained roughly unchanged at 0.0%.

St. Marys's Hispanic Population

0 residents of St. Marys, or 0.0% of the population, identify as Hispanic. The share of Hispanic residents in St. Marys is lower than in Iowa overall, where 7.3% of the population is Hispanic. St. Marys ranks 463rd statewide in terms of Hispanic residents as a share of the population, out of 1,026 places.

Since the 2020 Census, St. Marys's Hispanic population has declined by an estimated 100.0%. Hispanic residents' share of St. Marys's population has decreased from 2.8% to 0.0%.

St. Marys is less Hispanic than neighboring Martensdale (3.3% Hispanic), St. Charles (10.4% Hispanic), and Spring Hill (5.1% 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 Iowa overall, where 0.6% of the population is Native American/Other. St. Marys ranks 637th statewide in terms of Native American/Other residents as a share of the population, out of 1,026 places.

Since the 2020 Census, St. Marys's Native American/Other population has grown from 0 to an estimated 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 Martensdale (0.2% Native American/Other), St. Charles (1.3% Native American/Other), and Bevington (20% Native American/Other).

St. Marys's Multiracial Population

2 residents of St. Marys, or 2.1% of the population, identify as Multiracial. The share of Multiracial residents in St. Marys is comparable to the share in Iowa overall, where 3.5% of the population is Multiracial. St. Marys ranks 901st statewide in terms of Multiracial residents as a share of the population, out of 1,026 places.

Since the 2020 Census, St. Marys's Multiracial population has grown by an estimated 100.0%. Multiracial residents' share of St. Marys's population has increased from 0.9% to 2.1%.

St. Marys is more Multiracial than neighboring St. Charles (1.8% Multiracial), Bevington (0% Multiracial), and New Virginia (1.9% Multiracial). St. Marys is less Multiracial than neighboring Martensdale (6.5% Multiracial), and Spring Hill (7.7% 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.