Mexican Population in Illinois by County : 2025 Ranking & Insights

According to U.S. Census estimates, the Mexican population in Illinois totals 1.8 million. Every county in the state reports a non-zero population, with Cook County leading at 1.0 million, followed by Kane County (141,936) and Lake County (134,243). This demographic analysis ranks all counties in Illinois by their Mexican population, offering insights into regional distribution patterns and highlighting county-level concentrations across the state.

Top 5 counties with the largest Mexican population in Illinois

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  • 1
    Cook County
    Mexican population in Cook County is 1,038,075
    20.02% of Cook County population is Mexican
  • 2
    Kane County
    Mexican population in Kane County is 141,936
    27.50% of Kane County population is Mexican
  • 3
    Lake County
    Mexican population in Lake County is 134,243
    18.86% of Lake County population is Mexican
  • 4
    Will County
    Mexican population in Will County is 113,476
    16.25% of Will County population is Mexican
  • 5
    DuPage County
    Mexican population in DuPage County is 108,493
    11.70% of DuPage County population is Mexican

Overview of Mexican population in Illinois

  • Population Count and Percentage: American Community Survey show Illinois contains 1.8 million Mexican residents (14.2% of 12.7 million total state population), positioning the state at the 93rd percentile nationally among U.S. states for Mexican population concentrations.
  • Comparison to State and National Averages: U.S. Census data records indicate Illinois's Mexican population of 14.2% exceeds the national average of 11.3% by a factor of 1.3.
  • Share of Total National Population: Official American Community Survey records show Illinois hosts 1.8 million Mexican residents, representing 4.8% of the nation's total Mexican population of 37.4 million, establishing the state as a significant demographic concentration center within national boundaries.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey data indicates Illinois's density of 32.5 Mexican Americans per square mile exceeds the national average of 10.6 per square mile by just over triple, establishing the state as a significant concentration center for Mexican demographic communities.
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102 Counties in Illinois Ranked by Mexican Population

View Methodology
American Community Survey data [1] show Mexican populations across every county in Illinois, with demographic distributions ranging from the highest population in Cook County to the lowest in $rank_n_geo_name. The table below provides broader statistics, including total population figures, density measures, and demographic distributions based on current ACS data for all counties included in this analysis*.
counties in Illinois ranked by Mexican population count
Rank by Mexican Population
County
Mexican Population
% of Total County Population
% of Total Illinois Mexican Population
5 Year Rank Trend
1 Cook County 1,038,075 20.02% 57.54%
2 Kane County 141,936 27.50% 7.87%
3 Lake County 134,243 18.86% 7.44%
4 Will County 113,476 16.25% 6.29%
5 DuPage County 108,493 11.70% 6.01%
6 McHenry County 37,948 12.19% 2.10%
7 Winnebago County 34,074 12.03% 1.89%
8 24,728 18.31% 1.37%
9 17,863 12.49% 0.99%
10 11,632 21.82% 0.64%
11 11,195 10.48% 0.62%
12 10,667 10.61% 0.59%
13 10,331 9.47% 0.57%
14 10,210 4.95% 0.57%
15 8,047 3.16% 0.45%
16 7,896 4.62% 0.44%
17 7,726 2.92% 0.43%
18 7,030 3.91% 0.39%
19 5,901 10.69% 0.33%
20 5,046 9.79% 0.28%
21 4,562 8.62% 0.25%
22 3,317 4.53% 0.18%
23 2,990 9.05% 0.17%
24 2,844 5.81% 0.16%
25 2,538 1.30% 0.14%
26 2,447 1.87% 0.14%
27 2,194 4.45% 0.12%
28 2,055 16.02% 0.11%
29 1,870 6.99% 0.10%
30 1,736 5.10% 0.10%
31 1,713 3.89% 0.10%
32 1,703 1.66% 0.09%
33 1,633 3.10% 0.09%
34 1,509 9.10% 0.08%
35 1,486 7.55% 0.08%
36 1,321 2.83% 0.07%
37 1,299 3.64% 0.07%
38 1,038 1.55% 0.06%
39 995 1.53% 0.06%
40 930 2.52% 0.05%
41 788 2.34% 0.04%
42 669 2.01% 0.04%
43 667 2.46% 0.04%
44 654 2.98% 0.04%
45 653 3.14% 0.04%
46 647 1.98% 0.04%
47 625 3.68% 0.03%
48 613 2.20% 0.03%
49 594 1.97% 0.03%
50 540 1.44% 0.03%
51 521 1.42% 0.03%
52 510 1.33% 0.03%
53 489 1.40% 0.03%
54 483 1.30% 0.03%
55 478 3.06% 0.03%
56 474 2.85% 0.03%
57 421 1.97% 0.02%
57 421 2.70% 0.02%
58 412 1.19% 0.02%
59 391 1.39% 0.02%
60 350 0.79% 0.02%
61 342 2.56% 0.02%
62 337 2.88% 0.02%
63 335 2.50% 0.02%
64 332 2.15% 0.02%
65 297 5.30% 0.02%
66 295 2.11% 0.02%
67 285 1.34% 0.02%
68 261 1.12% 0.01%
69 256 1.67% 0.01%
70 244 1.40% 0.01%
71 239 1.58% 0.01%
72 233 1.25% 0.01%
73 191 3.02% 0.01%
74 174 1.19% 0.01%
75 165 1.05% 0.01%
76 158 1.15% 0.01%
77 154 0.92% 0.01%
78 138 0.66% 0.01%
79 137 1.00% 0.01%
80 136 0.82% 0.01%
81 107 1.70% 0.01%
82 106 0.73% 0.01%
83 96 0.79% 0.01%
84 93 1.01% 0.01%
85 90 1.77% 0.01%
86 81 1.19% 0.00%
86 81 1.52% 0.00%
87 72 0.61% 0.00%
88 70 0.44% 0.00%
89 62 1.65% 0.00%
89 62 1.28% 0.00%
90 61 0.47% 0.00%
91 60 0.46% 0.00%
92 57 0.51% 0.00%
93 42 0.53% 0.00%
94 37 0.76% 0.00%
95 33 0.91% 0.00%
96 31 0.61% 0.00%
97 22 0.21% 0.00%
98 18 0.29% 0.00%
99 7 0.16% 0.00%
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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 county in Illinois 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 county. To provide additional context, we’ve also included two key percentages:
  1. % of Total County Population – This shows what percentage of the total state population identifies as Mexican .
  2. % of Total Illinois 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.
  • County 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.