Mexican Population in Will County, IL by City : 2025 Ranking & Insights

The Mexican population in Will County, IL is officially recorded at 113,476, with all of the county''s incorporated cities reporting residents of Mexican ancestry. Among them, Joliet (45,202), Bolingbrook (18,259), and Romeoville (13,110) account for the largest shares. Interestingly, when adding up individual city estimates, the total surpasses the county-level figure - a difference that often arises from how city and county statistics are modeled separately. Below, we explore how Mexican communities are distributed across Illinois''s more urbanized and fragmented counties.

Top 5 cities with the largest Mexican population in Will County

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  • 1
    Joliet
    Mexican population in Joliet is 45,202
    30.18% of Joliet population is Mexican
  • 2
    Bolingbrook
    Mexican population in Bolingbrook is 18,259
    24.74% of Bolingbrook population is Mexican
  • 3
    Romeoville
    Mexican population in Romeoville is 13,110
    31.98% of Romeoville population is Mexican
  • 4
    Naperville
    Mexican population in Naperville is 7,315
    4.90% of Naperville population is Mexican
  • 5
    Tinley Park
    Mexican population in Tinley Park is 4,070
    7.40% of Tinley Park population is Mexican

Overview of Mexican population in Will County

  • Population Count and Percentage: American Community Survey data document Will County with 113,476 Mexican residents (16.2% of 698,450 total county population), placing the jurisdiction at the 98th percentile nationally among counties and 96th percentile within Illinois for Mexican population density, with demographic concentrations among the highest nationwide.
  • Comparison to State and National Averages: Census Bureau's ACS show Will County's Mexican population of 16.2% surpassing both Illinois's state average of 14.2% and the national average of 11.3%, positioning the county as a high-concentration jurisdiction exceeding demographic benchmarks across all geographic scales.
  • Share of Total State Population: Official American Community Survey data documents Will County with 113,476 Mexican residents, representing 6.3% of Illinois's total Mexican population of 1.8 million.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey indicate Will County's density of 135.8 Mexican Americans per square mile exceeds Illinois's average of 32.5 per square mile by just over quadruple, establishing the county as a significant concentration center for Mexican demographic communities.
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28 Cities in Will County Ranked by Mexican Population

View Methodology
ACS data [1] confirm Mexican populations in every incorporated city in the county, with the largest counts in Joliet, Bolingbrook, Romeoville, and Naperville. The table below provides detailed figures, including total population, density measures, and demographic distributions, based on the current ACS data for all 28 incorporated cities included in this analysis*.
cities in Will County, IL ranked by Mexican population count
Rank by Mexican Population
City
Mexican Population
% of Total City Population
% of Total Will County Mexican Population
5 Year Rank Trend
1 Joliet 45,202 30.18% 39.83%
2 Bolingbrook 18,259 24.74% 16.09%
3 Romeoville 13,110 31.98% 11.55%
4 Naperville 7,315 4.90% 6.45%
5 Tinley Park 4,070 7.40% 3.59%
6 Crest Hill 4,001 20.25% 3.53%
7 Plainfield 3,049 6.67% 2.69%
8 1,862 19.71% 1.64%
9 1,790 6.82% 1.58%
10 1,678 8.03% 1.48%
11 1,676 6.84% 1.48%
12 1,632 8.96% 1.44%
13 1,187 9.40% 1.05%
14 1,180 4.30% 1.04%
15 1,152 44.34% 1.02%
16 1,021 7.37% 0.90%
17 889 8.62% 0.78%
18 876 4.29% 0.77%
19 789 3.96% 0.70%
20 632 7.54% 0.56%
21 493 9.66% 0.43%
22 458 7.42% 0.40%
23 370 6.72% 0.33%
24 300 6.20% 0.26%
25 258 12.05% 0.23%
26 230 3.24% 0.20%
27 150 3.36% 0.13%
28 18 3.35% 0.02%
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Methodology

This ranking list is based on data from the American Community Survey (ACS) 5-Year Estimates, conducted by the U.S. Census Bureau. The ACS is one of the most reliable sources for understanding population trends across different locations, and it provides estimates for various racial and ethnic groups at city, county, state and all geography levels down to the Census block group.
This list ranks city in Will County, IL by their Mexican population, using the most recent ACS data available.

How the Census defines Mexican population

The U.S. Census Bureau allows people to self-identify their ancestry, meaning individuals can write upto ancestries when responding to the survey. In this ranking, we include everyone who identifies as having Mexican ancestry, whether alone or in combination with another ancestry.
Here are a few important things to know about how ancestry is reported:
  • Some people identify as Mexican alone, while others identify as Mexican along with another race (such as Mexican and German).
  • We’ve used the “Mexican alone or in any combination” category unless noted otherwise, which gives a broader picture of the Mexican population in each area.

How We Ranked the Data

This ranking is based on the total number of people who identified as Mexican alone or in combination in city. To provide additional context, we’ve also included two key percentages:
  1. % of Total City Population – This shows what percentage of the total state population identifies as Mexican .
  2. % of Total Will County Mexican Population – This tells us how much of the entire U.S. Mexican population lives in that state.
To keep things simple, all population numbers have been rounded to the nearest whole number, and percentages are rounded to one decimal place. Because of rounding, some percentages may not add up to exactly 100%.

Things to Keep in Mind

Like all survey-based data, ACS estimates come with some limitations. Here are a few things to be aware of:
  • In places with very small Mexican populations, the numbers may not be reported at all due to privacy protections or sampling variability in the survey.
  • Since the ACS is based on a sample, the numbers are estimates, not exact counts. That means they may slightly differ from other sources like the decennial U.S. Census.
  • City that don’t have any reported Mexican population are not included in the ranking but are listed separately below for reference.
This ranking is meant to provide a clear, data-driven look at where Mexican populations are most concentrated while keeping the numbers easy to understand.

Sources

  1. 2019-2023 5-Year Estimates.
  2. 2023.