2025

Cities in St. Clair County, IL ranked by Asian Population

This list ranks the 38 cities in St. Clair County based on their Asian population, as estimated by the United States Census Bureau. It also highlights population changes in these cities over the past five years.
Updated Jan 24, 2025

Top 5 cities with the largest Asian population in St. Clair County

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  • 1
    O'Fallon
    Asian population in O'Fallon is 1,311
    3.70% of O'Fallon population is Asian
  • 2
    Belleville
    Asian population in Belleville is 869
    1.93% of Belleville population is Asian
  • 3
    Fairview Heights
    Asian population in Fairview Heights is 681
    3.71% of Fairview Heights population is Asian
  • 4
    Swansea
    Asian population in Swansea is 613
    3.89% of Swansea population is Asian
  • 5
    Collinsville
    Asian population in Collinsville is 428
    0.83% of Collinsville population is Asian

List of 38 cities in St. Clair County, IL by Asian Population

View Methodology
Rank by Asian Population
City
Asian Population
% of Total City Population
% of Total St. Clair County Asian Population
5 Year Rank Trend
1 O'Fallon 1,311 3.70% 22.96%
2 Belleville 869 1.93% 15.22%
3 Fairview Heights 681 3.71% 11.92%
4 Swansea 613 3.89% 10.73%
5 Collinsville 428 0.83% 7.49%
5 Collinsville 428 0.83% 7.49%
6 Shiloh 389 2.51% 6.81%
7 379 3.92% 6.64%
8 355 1.91% 6.22%
9 170 0.74% 2.98%
9 170 0.74% 2.98%
10 117 2.40% 2.05%
11 110 2.64% 1.93%
12 93 1.99% 1.63%
13 55 1.32% 0.96%
14 40 0.73% 0.70%
14 40 0.73% 0.70%
15 28 0.63% 0.49%
16 22 0.35% 0.39%
16 22 0.35% 0.39%
17 20 0.25% 0.35%
17 20 0.25% 0.35%
18 10 0.55% 0.18%
19 8 0.66% 0.14%
19 8 0.66% 0.14%
20 6 0.96% 0.11%
21 5 0.24% 0.09%
22 2 0.54% 0.04%

List of cities with no Asian Population in St. Clair County, IL

According to data from the United States Census Bureau, the following cities in St. Clair County have no recorded Asian population*:
  • Brooklyn
  • East Carondelet
  • Fayetteville
  • Lenzburg
  • Marissa
  • Sauget
  • Smithton
  • Alorton
  • Cahokia
  • Centreville
* These cities were not included in the ranking above, as they do not meet the population criteria. It is possible that a small population exists but was not reported or captured due to limitations or variations in Census data collection and reporting.

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 cities in St. Clair County, IL by their Asian population, using the most recent ACS data available.

How the Census Defines Asian Population

The U.S. Census Bureau allows people to self-identify their race, meaning individuals can choose one or more racial categories when responding to the survey. In this ranking, we include everyone who identifies as Asian, whether alone or in combination with another race.
Here are a few important things to know about how race is reported:
  • Some people identify as Asian alone, while others identify as Asian along with another race (such as Asian and White).
  • Hispanic / Latino origin is reported separately from race, so someone can be both Hispanic and Asian .
  • We’ve used the “Asian alone or in combination” category unless noted otherwise, which gives a broader picture of the Asian population in each area.

How We Ranked the Data

This ranking is based on the total number of people who identified as Asian alone or in combination in cities. 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 Asian .
  2. % of Total St. Clair County Asian Population – This tells us how much of the entire U.S. Asian 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 Asian 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.
  • Cities that don’t have any reported Asian 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 Asian populations are most concentrated while keeping the numbers easy to understand.

Sources

U.S. Census Bureau American Community Survey (ACS) 2019-2023 5-Year Estimates.