Irish Population in Oregon by County : 2025 Ranking & Insights

According to U.S. Census estimates, the Irish population in Oregon totals 461,857. Every county in the state reports a non-zero population, with Multnomah County leading at 89,275, followed by Washington County (54,474) and Lane County (50,246). This demographic analysis ranks all counties in Oregon by their Irish population, offering insights into regional distribution patterns and highlighting county-level concentrations across the state.

Top 5 counties with the largest Irish population in Oregon

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  • 1
    Multnomah County
    Irish population in Multnomah County is 89,275
    11.11% of Multnomah County population is Irish
  • 2
    Washington County
    Irish population in Washington County is 54,474
    9.08% of Washington County population is Irish
  • 3
    Lane County
    Irish population in Lane County is 50,246
    13.13% of Lane County population is Irish
  • 4
    Clackamas County
    Irish population in Clackamas County is 48,358
    11.45% of Clackamas County population is Irish
  • 5
    Marion County
    Irish population in Marion County is 28,460
    8.21% of Marion County population is Irish

Overview of Irish population in Oregon

  • Population Count and Percentage: American Community Survey show Oregon contains 461,857 Irish residents (10.9% of 4.2 million total state population), positioning the state at the 52nd percentile nationally among U.S. states for Irish population concentrations.
  • Comparison to State and National Averages: U.S. Census data records indicate Oregon's Irish population of 10.9% exceeds the national average of 9.4% by a factor of 1.2.
  • Share of Total National Population: Official American Community Survey document Oregon's 461,857 Irish residents constitute 1.5% of the nation's total Irish population of 31.2 million, providing the state with a measurable but modest share of the national demographic community.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey document Oregon contains 4.8 Irish per square mile, below the national average of 8.8 per square mile, while maintaining moderate community presence relative to national concentration standards.
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36 Counties in Oregon Ranked by Irish Population

View Methodology
American Community Survey data [1] show Irish populations across every county in Oregon, with demographic distributions ranging from the highest population in Multnomah 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 Oregon ranked by Irish population count
Rank by Irish Population
County
Irish Population
% of Total County Population
% of Total Oregon Irish Population
5 Year Rank Trend
1 Multnomah County 89,275 11.11% 19.33%
2 Washington County 54,474 9.08% 11.79%
3 Lane County 50,246 13.13% 10.88%
4 Clackamas County 48,358 11.45% 10.47%
5 Marion County 28,460 8.21% 6.16%
6 Deschutes County 27,994 13.79% 6.06%
7 Jackson County 27,518 12.36% 5.96%
8 14,551 11.21% 3.15%
9 13,899 12.43% 3.01%
10 12,041 11.14% 2.61%
11 11,399 11.83% 2.47%
12 10,808 12.27% 2.34%
13 8,012 9.05% 1.73%
14 7,821 12.06% 1.69%
15 7,785 11.15% 1.69%
16 6,078 11.43% 1.32%
17 5,735 11.33% 1.24%
18 5,657 7.06% 1.22%
19 5,237 12.67% 1.13%
20 3,455 12.58% 0.75%
21 2,627 11.20% 0.57%
22 2,573 10.03% 0.56%
23 2,450 9.21% 0.53%
24 2,408 9.19% 0.52%
25 2,324 7.33% 0.50%
26 2,184 8.75% 0.47%
27 1,948 11.60% 0.42%
28 1,724 7.20% 0.37%
29 1,233 14.94% 0.27%
30 966 7.89% 0.21%
31 767 10.21% 0.17%
32 615 8.17% 0.13%
33 446 6.16% 0.10%
34 299 14.94% 0.06%
35 267 18.62% 0.06%
36 223 11.69% 0.05%
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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 Oregon 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 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 Irish .
  2. % of Total Oregon 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.
  • County 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.