Rochester, IL Demographics

A map of Rochester's Population by Race

Rochester, Illinois has an estimated population of 3,766, a slight decrease from the 3,863 recorded in the 2020 Census. The population is 91.6% White, 3.8% Multiracial, 2.1% Asian, 1.5% Black, 1.0% Hispanic, and 0.0% Native American/Other. This demographic dot map shows the population of Rochester, with one dot drawn for each person counted by the Census, color-coded by race.

Rochester has become slightly 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 Rochester, that probability was 16.4% in 2020 and 15.9% in the most recent ACS estimates.

Rochester is ranked the 391st 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). Rochester was ranked the 389th most populous place in the 2020 Census.

Rochester's White Population

3,449 residents of Rochester, or 91.6% of the population, identify as White. The share of White residents in Rochester is significantly higher than in Illinois overall, where 58.1% of the population is White. Rochester ranks 678th statewide in terms of White residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Rochester's White population has declined by an estimated 2.2%. White residents' share of Rochester's population has remained roughly unchanged at 91.6%.

Rochester is more White than neighboring Grandview (76% White), Southern View (79.8% White), Springfield (69.3% White), and Spaulding (91.5% White). Rochester is less White than neighboring Riverton (94% White).

Rochester's Black Population

57 residents of Rochester, or 1.5% of the population, identify as Black. The share of Black residents in Rochester is considerably lower than in Illinois overall, where 13.3% of the population is Black. Rochester ranks 585th statewide in terms of Black residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Rochester's Black population has grown by an estimated 50.0%. Black residents' share of Rochester's population has increased from 1.0% to 1.5%.

Rochester is less Black than neighboring Riverton (2.3% Black), Grandview (12.2% Black), Southern View (9.1% Black), Springfield (19.1% Black), and Spaulding (3.9% Black).

Rochester's Asian Population

78 residents of Rochester, or 2.1% of the population, identify as Asian. The share of Asian residents in Rochester is slightly lower than in Illinois overall, where 5.9% of the population is Asian. Rochester ranks 349th statewide in terms of Asian residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Rochester's Asian population has grown by an estimated 81.4%. Asian residents' share of Rochester's population has increased from 1.1% to 2.1%.

Rochester is more Asian than neighboring Riverton (0.6% Asian), Grandview (0.4% Asian), Southern View (0.9% Asian), and Spaulding (1.3% Asian). Rochester is less Asian than neighboring Springfield (3% Asian).

Rochester's Hispanic Population

38 residents of Rochester, or 1.0% of the population, identify as Hispanic. The share of Hispanic residents in Rochester is significantly lower than in Illinois overall, where 18.8% of the population is Hispanic. Rochester ranks 1107th statewide in terms of Hispanic residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Rochester's Hispanic population has declined by an estimated 35.6%. Hispanic residents' share of Rochester's population has decreased from 1.5% to 1.0%.

Rochester is more Hispanic than neighboring Spaulding (0.5% Hispanic). Rochester is less Hispanic than neighboring Riverton (1.9% Hispanic), Grandview (4.9% Hispanic), Southern View (4.3% Hispanic), and Springfield (3.4% Hispanic).

Rochester's Native American/Other Population

0 residents of Rochester, 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 Rochester is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Rochester ranks 589th statewide in terms of Native American/Other residents as a share of the population, out of 1,461 places.

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

Rochester is less Native American/Other than neighboring Grandview (0.2% Native American/Other), Southern View (0.6% Native American/Other), Springfield (0.9% Native American/Other), and Spaulding (1% Native American/Other).

Rochester's Multiracial Population

144 residents of Rochester, or 3.8% of the population, identify as Multiracial. The share of Multiracial residents in Rochester is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Rochester ranks 334th statewide in terms of Multiracial residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Rochester's Multiracial population has declined by an estimated 19.6%. Multiracial residents' share of Rochester's population has decreased from 4.6% to 3.8%.

Rochester is more Multiracial than neighboring Riverton (1.2% Multiracial), and Spaulding (1.9% Multiracial). Rochester is less Multiracial than neighboring Grandview (6.3% Multiracial), Southern View (5.2% Multiracial), and Springfield (4.3% 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.