Irish Population in St. Louis County, MO by City : 2025 Ranking & Insights

The Irish population in St. Louis County, MO is reported at 122,142 residents, according to recent U.S. Census estimates. Several cities in St. Louis County - including Chesterfield, Kirkwood, Florissant, and others - contribute to the Irish population, but the total county figure of 122,142 indicates additional presence beyond municipal borders. The sections below explores how Irish residents are distributed in Missouri and the U.S.

Top 5 cities with the largest Irish population in St. Louis County

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  • 1
    Chesterfield
    Irish population in Chesterfield is 6,780
    13.67% of Chesterfield population is Irish
  • 2
    Kirkwood
    Irish population in Kirkwood is 6,231
    21.26% of Kirkwood population is Irish
  • 3
    Florissant
    Irish population in Florissant is 5,804
    11.18% of Florissant population is Irish
  • 4
    Ballwin
    Irish population in Ballwin is 5,657
    18.35% of Ballwin population is Irish
  • 5
    Wildwood
    Irish population in Wildwood is 5,357
    15.23% of Wildwood population is Irish

Overview of Irish population in St. Louis County

  • Population Count and Percentage: American Community Survey data document St. Louis County with 122,142 Irish residents (12.3% of 996,618 total county population), placing the jurisdiction at the 99th percentile nationally among counties and 99th percentile within Missouri for Irish population density, with demographic concentrations among the highest nationwide.
  • Comparison to State and National Averages: Census Bureau's ACS show St. Louis County's Irish population of 12.3% surpassing both Missouri's state average of 11.8% and the national average of 9.4%, positioning the county as a high-concentration jurisdiction exceeding demographic benchmarks across all geographic scales.
  • Share of Total State Population: Official American Community Survey indicate St. Louis County's 122,142 Irish residents constitute 16.8% of Missouri's total Irish population of 728,128, placing the county among jurisdictions with the highest demographic concentrations, with 16.8% of all Missouri Irish Americans residing within county boundaries.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey data shows St. Louis County maintains 240.4 Irish Americans per square mile, representing twenty-two and three-quarters times Missouri's average of 10.6 per square mile, establishing the county as an exceptional concentration center comparable to major metropolitan demographic areas.
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78 Cities in St. Louis County Ranked by Irish Population

View Methodology
ACS data [1] show Irish populations distributed across multiple cities in the county, led by Chesterfield, Kirkwood, Florissant, and Ballwin. The table below provides additional context, including total population, population density, and demographic distributions, based on current ACS data for 78 incorporated cities included in this analysis*.
cities in St. Louis County, MO ranked by Irish population count
Rank by Irish Population
City
Irish Population
% of Total City Population
% of Total St. Louis County Irish Population
5 Year Rank Trend
1 Chesterfield 6,780 13.67% 5.55%
2 Kirkwood 6,231 21.26% 5.10%
3 Florissant 5,804 11.18% 4.75%
4 Ballwin 5,657 18.35% 4.63%
5 Wildwood 5,357 15.23% 4.39%
6 Webster Groves 5,075 21.35% 4.16%
7 Maryland Heights 3,314 11.84% 2.71%
8 2,887 11.45% 2.36%
9 2,850 8.22% 2.33%
10 2,620 14.05% 2.15%
11 2,403 19.54% 1.97%
12 2,375 13.74% 1.94%
13 2,181 11.99% 1.79%
14 1,959 21.42% 1.60%
15 1,832 20.10% 1.50%
16 1,702 14.67% 1.39%
17 1,692 13.68% 1.39%
18 1,660 14.60% 1.36%
19 1,627 17.73% 1.33%
20 1,545 15.59% 1.26%
21 1,457 23.84% 1.19%
22 1,437 11.17% 1.18%
23 1,414 8.97% 1.16%
24 1,313 16.10% 1.08%
25 1,303 15.99% 1.07%
26 1,188 16.28% 0.97%
27 1,110 17.54% 0.91%
28 960 10.73% 0.79%
29 893 13.10% 0.73%
30 884 18.78% 0.72%
31 855 4.66% 0.70%
32 730 19.90% 0.60%
33 725 17.74% 0.59%
34 620 14.05% 0.51%
35 590 8.99% 0.48%
36 536 23.18% 0.44%
37 498 19.21% 0.41%
38 444 5.20% 0.36%
39 389 14.47% 0.32%
40 371 15.68% 0.30%
41 326 22.06% 0.27%
42 312 7.93% 0.26%
43 273 16.86% 0.22%
44 220 11.49% 0.18%
45 197 21.53% 0.16%
46 195 1.85% 0.16%
47 192 3.94% 0.16%
48 189 12.84% 0.15%
49 179 2.71% 0.15%
50 161 9.07% 0.13%
51 159 10.14% 0.13%
52 110 0.85% 0.09%
53 105 3.91% 0.09%
54 103 9.33% 0.08%
55 102 7.97% 0.08%
56 96 14.01% 0.08%
57 95 2.23% 0.08%
58 89 4.50% 0.07%
59 87 13.10% 0.07%
59 87 7.55% 0.07%
60 86 2.35% 0.07%
61 76 12.42% 0.06%
62 73 2.60% 0.06%
63 63 0.77% 0.05%
64 51 10.81% 0.04%
65 43 1.58% 0.04%
66 28 3.48% 0.02%
67 27 0.99% 0.02%
68 23 0.90% 0.02%
69 22 1.67% 0.02%
70 21 2.06% 0.02%
71 13 0.75% 0.01%
72 4 0.31% 0.00%
73 3 0.39% 0.00%
74 0 - -
74 0 - -
74 0 - -
74 0 - -
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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 St. Louis County, MO by their Irish population, using the most recent ACS data available.

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

How We Ranked the Data

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

Sources

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