English Population in Williamson County, IL by City : 2025 Ranking & Insights

The English population in Williamson County, IL is recorded at 9,358 residents, based on the latest U.S. Census estimates. Each city in Williamson County, IL has some English population, but the county''s higher total suggests additional rural or non-municipal representation. The analysis below explores how English communities are spread across Williamson County, IL and comparable counties throughout Illinois.

Top 5 cities with the largest English population in Williamson County

View All
  • 1
    Marion
    English population in Marion is 2,131
    12.69% of Marion population is English
  • 2
    Herrin
    English population in Herrin is 1,535
    12.51% of Herrin population is English
  • 3
    Carterville
    English population in Carterville is 1,255
    21.56% of Carterville population is English
  • 4
    Johnston City
    English population in Johnston City is 747
    22.29% of Johnston City population is English
  • 5
    Crainville
    English population in Crainville is 241
    14.93% of Crainville population is English

Overview of English population in Williamson County

  • Population Count and Percentage: American Community Survey data document Williamson County with 9,358 English residents (14% of 66,902 total county population), placing the jurisdiction at the 77th percentile nationally among counties and 82nd percentile within Illinois for English population density, with demographic concentrations among the highest nationwide.
  • Comparison to State and National Averages: Census Bureau's ACS show Williamson County's English population of 14% surpassing both Illinois's state average of 6.6% and the national average of 9.1%, positioning the county as a high-concentration jurisdiction exceeding demographic benchmarks across all geographic scales.
  • Share of Total State Population: Official American Community Survey show Williamson County's 9,358 English residents constitute 1.1% of Illinois's total English population of 840,615.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey shows Williamson County maintains 22.3 English Americans per square mile compared to Illinois's average of 15.1, indicating higher demographic concentration relative to state averages.
  • Need additional overviews? Extended research data available for purchase and license. ➔

10 Cities in Williamson County Ranked by English Population

View Methodology
ACS data [1] confirm English populations in every incorporated city in the county, with the largest counts in Marion, Herrin, Carterville, and Johnston City. The table below provides detailed figures, including total population, density measures, and demographic distributions, based on the current ACS data for all 10 incorporated cities included in this analysis*.
cities in Williamson County, IL ranked by English population count
Rank by English Population
City
English Population
% of Total City Population
% of Total Williamson County English Population
5 Year Rank Trend
1 Marion 2,131 12.69% 22.77%
2 Herrin 1,535 12.51% 16.40%
3 Carterville 1,255 21.56% 13.41%
4 Johnston City 747 22.29% 7.98%
5 Crainville 241 14.93% 2.58%
6 Cambria 152 11.96% 1.62%
7 Energy 122 10.42% 1.30%
8 84 16.31% 0.90%
9 83 12.12% 0.89%
10 22 6.21% 0.24%
Need the complete table? Full rankings and the underlying data sets for California and other locations are available for purchase or license.

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 Williamson County, IL by their English population, using the most recent ACS data available.

How the Census defines English 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 English 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 English alone, while others identify as English along with another race (such as English and German).
  • We’ve used the “English alone or in any combination” category unless noted otherwise, which gives a broader picture of the English population in each area.

How We Ranked the Data

This ranking is based on the total number of people who identified as English 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 English .
  2. % of Total Williamson County English Population – This tells us how much of the entire U.S. English 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 English 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 English 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 English populations are most concentrated while keeping the numbers easy to understand.

Sources

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