Waterloo, IL Demographics

A map of Waterloo's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	10,470	10,251	94.1%	93.1%
Hispanic	200	220	1.8%	2.0%
Asian	189	73	1.7%	0.7%
Multiracial	140	405	1.3%	3.7%
Black	115	29	1.0%	0.3%
Native American/Other	15	35	0.1%	0.3%

Waterloo, Illinois has an estimated population of 11,129, a slight increase from the 11,013 recorded in the 2020 Census. The population is 94.1% White, 1.8% Hispanic, 1.7% Asian, 1.3% Multiracial, 1.0% Black, and 0.1% Native American/Other. This demographic dot map shows the population of Waterloo, with one dot drawn for each person counted by the Census, color-coded by race.

Waterloo 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 Waterloo, that probability was 13.2% in 2020 and 11.4% in the most recent ACS estimates.

Waterloo is ranked the 208th 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). Waterloo was ranked the 207th most populous place in the 2020 Census.

Waterloo's White Population

10,470 residents of Waterloo, or 94.1% of the population, identify as White. The share of White residents in Waterloo is significantly higher than in Illinois overall, where 58.1% of the population is White. Waterloo ranks 465th statewide in terms of White residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Waterloo's White population has grown by an estimated 2.1%. White residents' share of Waterloo's population has increased from 93.1% to 94.1%.

Waterloo is more White than neighboring Floraville (0% White), and Millstadt (91.8% White). Waterloo is less White than neighboring Paderborn (100% White), Columbia (94.9% White), and Maeystown (100% White).

Waterloo's Black Population

115 residents of Waterloo, or 1.0% of the population, identify as Black. The share of Black residents in Waterloo is considerably lower than in Illinois overall, where 13.3% of the population is Black. Waterloo ranks 1004th statewide in terms of Black residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Waterloo's Black population has grown by an estimated 296.6%. Black residents' share of Waterloo's population has increased from 0.3% to 1.0%.

Waterloo is more Black than neighboring Floraville (0% Black), Paderborn (0% Black), Columbia (0.7% Black), Millstadt (0% Black), and Maeystown (0% Black).

Waterloo's Asian Population

189 residents of Waterloo, or 1.7% of the population, identify as Asian. The share of Asian residents in Waterloo is slightly lower than in Illinois overall, where 5.9% of the population is Asian. Waterloo ranks 521st statewide in terms of Asian residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Waterloo's Asian population has grown by an estimated 158.9%. Asian residents' share of Waterloo's population has increased from 0.7% to 1.7%.

Waterloo is more Asian than neighboring Floraville (0% Asian), Paderborn (0% Asian), Columbia (0.1% Asian), Millstadt (0% Asian), and Maeystown (0% Asian).

Waterloo's Hispanic Population

200 residents of Waterloo, or 1.8% of the population, identify as Hispanic. The share of Hispanic residents in Waterloo is significantly lower than in Illinois overall, where 18.8% of the population is Hispanic. Waterloo ranks 959th statewide in terms of Hispanic residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Waterloo's Hispanic population has declined by an estimated 9.1%. Hispanic residents' share of Waterloo's population has remained roughly unchanged at 1.8%.

Waterloo is more Hispanic than neighboring Floraville (0% Hispanic), Paderborn (0% Hispanic), Columbia (1.7% Hispanic), Millstadt (1.1% Hispanic), and Maeystown (0% Hispanic).

Waterloo's Native American/Other Population

15 residents of Waterloo, or 0.1% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Waterloo is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Waterloo ranks 854th statewide in terms of Native American/Other residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Waterloo's Native American/Other population has declined by an estimated 57.1%. Native American/Other residents' share of Waterloo's population has remained roughly unchanged at 0.1%.

Waterloo is more Native American/Other than neighboring Floraville (0% Native American/Other), Paderborn (0% Native American/Other), and Maeystown (0% Native American/Other). Waterloo is less Native American/Other than neighboring Columbia (0.2% Native American/Other), and Millstadt (2.5% Native American/Other).

Waterloo's Multiracial Population

140 residents of Waterloo, or 1.3% of the population, identify as Multiracial. The share of Multiracial residents in Waterloo is slightly lower than in Illinois overall, where 3.4% of the population is Multiracial. Waterloo ranks 641st statewide in terms of Multiracial residents as a share of the population, out of 1,461 places.

Since the 2020 Census, Waterloo's Multiracial population has declined by an estimated 65.4%. Multiracial residents' share of Waterloo's population has decreased from 3.7% to 1.3%.

Waterloo is more Multiracial than neighboring Floraville (0% Multiracial), Paderborn (0% Multiracial), and Maeystown (0% Multiracial). Waterloo is less Multiracial than neighboring Columbia (2.5% Multiracial), and Millstadt (4.6% 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.