Irish Population in Delaware County, PA by City : 2025 Ranking & Insights

The Irish population in Delaware County, PA is recorded at 127,668 residents, based on the latest U.S. Census estimates. Every city in Delaware County reports some Irish residents. With no unincorporated share evident in the totals, this points to a completely city-based population. The sections below explores how Irish residents are distributed in Pennsylvania and the U.S.

Top 5 cities with the largest Irish population in Delaware County

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  • 1
    Haverford township
    Irish population in Haverford township is 16,332
    32.36% of Haverford township population is Irish
  • 2
    Upper Darby township
    Irish population in Upper Darby township is 13,056
    15.33% of Upper Darby township population is Irish
  • 3
    Ridley township
    Irish population in Ridley township is 10,081
    32.71% of Ridley township population is Irish
  • 4
    Springfield township
    Irish population in Springfield township is 9,314
    37.33% of Springfield township population is Irish
  • 5
    Radnor township
    Irish population in Radnor township is 7,782
    23.25% of Radnor township population is Irish

Overview of Irish population in Delaware County

  • Population Count and Percentage: American Community Survey data document Delaware County with 127,668 Irish residents (22.2% of 576,195 total county population), placing the jurisdiction at the 99th percentile nationally among counties and 92nd percentile within Pennsylvania for Irish population density, with demographic concentrations among the highest nationwide.
  • Comparison to State and National Averages: Census Bureau's ACS show Delaware County's Irish population of 22.2% surpassing both Pennsylvania's state average of 14.8% 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 data documents Delaware County with 127,668 Irish residents, representing 6.6% of Pennsylvania's total Irish population of 1.9 million.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey data shows Delaware County maintains 694.6 Irish Americans per square mile, representing just over sixteen times Pennsylvania's average of 43 per square mile, establishing the county as an exceptional concentration center comparable to major metropolitan demographic areas.
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49 Cities in Delaware County Ranked by Irish Population

View Methodology
ACS data [1] confirm Irish populations in every incorporated city in the county, with the largest counts in Haverford township, Upper Darby township, Ridley township, and Springfield township. The table below provides detailed figures, including total population, density measures, and demographic distributions, based on the current ACS data for all 49 incorporated cities included in this analysis*.
cities in Delaware County, PA ranked by Irish population count
Rank by Irish Population
City
Irish Population
% of Total City Population
% of Total Delaware County Irish Population
5 Year Rank Trend
1 Haverford township 16,332 32.36% 12.79%
2 Upper Darby township 13,056 15.33% 10.23%
3 Ridley township 10,081 32.71% 7.90%
4 Springfield township 9,314 37.33% 7.30%
5 Radnor township 7,782 23.25% 6.10%
6 Marple township 6,752 27.98% 5.29%
7 Aston township 5,451 32.66% 4.27%
8 4,665 30.89% 3.65%
9 4,597 27.31% 3.60%
10 4,104 22.55% 3.21%
11 3,948 23.92% 3.09%
12 3,270 22.64% 2.56%
13 2,959 27.40% 2.32%
14 2,764 30.12% 2.17%
15 2,517 26.22% 1.97%
16 2,347 28.32% 1.84%
17 2,205 37.28% 1.73%
18 1,985 27.40% 1.55%
19 1,776 24.64% 1.39%
20 1,668 28.43% 1.31%
21 1,489 22.82% 1.17%
22 1,446 20.91% 1.13%
23 1,388 21.68% 1.09%
24 1,322 30.14% 1.04%
25 1,251 31.51% 0.98%
26 1,133 16.61% 0.89%
27 1,016 9.18% 0.80%
28 994 2.99% 0.78%
29 859 9.69% 0.67%
30 842 12.48% 0.66%
31 836 30.20% 0.65%
32 799 26.15% 0.63%
33 736 18.68% 0.58%
34 697 23.85% 0.55%
35 686 16.26% 0.54%
36 646 28.89% 0.51%
37 618 18.22% 0.48%
38 535 24.19% 0.42%
39 505 21.92% 0.40%
40 476 3.94% 0.37%
41 289 2.71% 0.23%
42 281 28.62% 0.22%
43 269 15.59% 0.21%
44 262 4.38% 0.21%
45 243 9.00% 0.19%
46 228 19.16% 0.18%
47 160 3.96% 0.13%
48 78 2.91% 0.06%
49 11 0.85% 0.01%
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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 Delaware County, PA 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 Delaware 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.