St. Joseph, IL Demographics

A map of St. Joseph's Population by Race

St. Joseph, Illinois has an estimated population of 3,778, a less than 1% change from the 3,810 recorded in the 2020 Census. The population is 91.9% White, 3.7% Hispanic, 2.6% Multiracial, 1.6% Asian, 0.2% Native American/Other, and 0.0% Black. This demographic dot map shows the population of St. Joseph, with one dot drawn for each person counted by the Census, color-coded by race.

St. Joseph has become less racially diverse since the 2020 Census. It is considerably less diverse than Illinois overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In St. Joseph, that probability was 16.5% in 2020 and 15.3% in the most recent ACS estimates.

St. Joseph is ranked the 389th most populous place in Illinois, out of 1,461 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. Joseph was ranked the 390th most populous place in the 2020 Census.

St. Joseph's White Population

3,472 residents of St. Joseph, or 91.9% of the population, identify as White. The share of White residents in St. Joseph is significantly higher than in Illinois overall, where 58.1% of the population is White. St. Joseph ranks 685th statewide in terms of White residents as a share of the population, out of 1,461 places.

Since the 2020 Census, St. Joseph's White population has remained roughly the same. White residents' share of St. Joseph's population has increased from 91.2% to 91.9%.

St. Joseph is more White than neighboring Ogden (88.7% White), and Royal (87.3% White). St. Joseph is less White than neighboring Sidney (93.9% White), Homer (93.3% White), and Fithian (96.9% White).

St. Joseph's Black Population

0 residents of St. Joseph, or 0.0% of the population, identify as Black. The share of Black residents in St. Joseph is considerably lower than in Illinois overall, where 13.3% of the population is Black. St. Joseph ranks 918th statewide in terms of Black residents as a share of the population, out of 1,461 places.

Since the 2020 Census, St. Joseph's Black population has declined by an estimated 100.0%. Black residents' share of St. Joseph's population has remained roughly unchanged at 0.0%.

St. Joseph is less Black than neighboring Ogden (0.5% Black), Sidney (0.2% Black), Royal (8.9% Black), and Homer (1.9% Black).

St. Joseph's Asian Population

62 residents of St. Joseph, or 1.6% of the population, identify as Asian. The share of Asian residents in St. Joseph is slightly lower than in Illinois overall, where 5.9% of the population is Asian. St. Joseph ranks 389th statewide in terms of Asian residents as a share of the population, out of 1,461 places.

Since the 2020 Census, St. Joseph's Asian population has grown by an estimated 67.6%. Asian residents' share of St. Joseph's population has increased from 1.0% to 1.6%.

St. Joseph is more Asian than neighboring Sidney (0.5% Asian), Royal (0% Asian), Homer (0% Asian), and Fithian (0% Asian). St. Joseph is less Asian than neighboring Ogden (5% Asian).

St. Joseph's Hispanic Population

139 residents of St. Joseph, or 3.7% of the population, identify as Hispanic. The share of Hispanic residents in St. Joseph is significantly lower than in Illinois overall, where 18.8% of the population is Hispanic. St. Joseph ranks 741st statewide in terms of Hispanic residents as a share of the population, out of 1,461 places.

Since the 2020 Census, St. Joseph's Hispanic population has grown by an estimated 20.9%. Hispanic residents' share of St. Joseph's population has increased from 3.0% to 3.7%.

St. Joseph is more Hispanic than neighboring Ogden (3.3% Hispanic), Sidney (3.6% Hispanic), Royal (0% Hispanic), Homer (3.1% Hispanic), and Fithian (1.9% Hispanic).

St. Joseph's Native American/Other Population

6 residents of St. Joseph, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in St. Joseph is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. St. Joseph ranks 274th statewide in terms of Native American/Other residents as a share of the population, out of 1,461 places.

Since the 2020 Census, St. Joseph's Native American/Other population has declined by an estimated 77.8%. Native American/Other residents' share of St. Joseph's population has remained roughly unchanged at 0.2%.

St. Joseph is more Native American/Other than neighboring Royal (0% Native American/Other), Homer (0% Native American/Other), and Fithian (0% Native American/Other). St. Joseph is less Native American/Other than neighboring Ogden (0.5% Native American/Other), and Sidney (1.1% Native American/Other).

St. Joseph's Multiracial Population

99 residents of St. Joseph, or 2.6% of the population, identify as Multiracial. The share of Multiracial residents in St. Joseph is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. St. Joseph ranks 643rd statewide in terms of Multiracial residents as a share of the population, out of 1,461 places.

Since the 2020 Census, St. Joseph's Multiracial population has declined by an estimated 29.3%. Multiracial residents' share of St. Joseph's population has decreased from 3.7% to 2.6%.

St. Joseph is more Multiracial than neighboring Ogden (1.9% Multiracial), Sidney (0.6% Multiracial), Homer (1.7% Multiracial), and Fithian (1.2% Multiracial). St. Joseph is less Multiracial than neighboring Royal (3.8% 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.