Irish Population in Idaho by County : 2025 Ranking & Insights

According to U.S. Census estimates, the Irish population in Idaho totals 175,128. Every county in the state reports a non-zero population, with Ada County leading at 57,330, followed by Kootenai County (20,784) and Canyon County (19,877). This demographic analysis ranks all counties in Idaho 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 Idaho

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  • 1
    Ada County
    Irish population in Ada County is 57,330
    11.28% of Ada County population is Irish
  • 2
    Kootenai County
    Irish population in Kootenai County is 20,784
    11.69% of Kootenai County population is Irish
  • 3
    Canyon County
    Irish population in Canyon County is 19,877
    8.20% of Canyon County population is Irish
  • 4
    Twin Falls County
    Irish population in Twin Falls County is 8,149
    8.85% of Twin Falls County population is Irish
  • 5
    Bonneville County
    Irish population in Bonneville County is 7,384
    5.81% of Bonneville County population is Irish

Overview of Irish population in Idaho

  • Population Count and Percentage: American Community Survey documents Idaho with 175,128 Irish residents (9.2% of 1.9 million total state population), ranking the state at the 18th percentile nationally among U.S. jurisdictions for Irish demographic representation.
  • Comparison to State and National Averages: U.S. Census data documents Idaho's Irish population of 9.2% corresponding to the national average, placing the state as demographically representative of typical U.S. distribution patterns.
  • Share of Total National Population: Official American Community Survey data indicates Idaho contains 175,128 Irish residents, representing less than 1% of the nation's total Irish population of 31.2 million, constituting a minimal fraction of the national demographic community relative to the state's overall population size.
  • Population Density per Square Mile: U.S. Census Bureau's American Community Survey document Idaho with 2.1 Irish Americans per square mile, below the national average of 8.8 per square mile, placing the state among jurisdictions with below-average demographic concentrations nationally.
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44 Counties in Idaho Ranked by Irish Population

View Methodology
American Community Survey data [1] show Irish populations across every county in Idaho, with demographic distributions ranging from the highest population in Ada 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 Idaho ranked by Irish population count
Rank by Irish Population
County
Irish Population
% of Total County Population
% of Total Idaho Irish Population
5 Year Rank Trend
1 Ada County 57,330 11.28% 32.74%
2 Kootenai County 20,784 11.69% 11.87%
3 Canyon County 19,877 8.20% 11.35%
4 Twin Falls County 8,149 8.85% 4.65%
5 Bonneville County 7,384 5.81% 4.22%
6 Bannock County 7,313 8.27% 4.18%
7 Bonner County 6,560 13.26% 3.75%
8 4,911 12.18% 2.80%
9 4,468 10.52% 2.55%
10 2,493 8.58% 1.42%
11 2,207 8.43% 1.26%
12 2,164 4.04% 1.24%
13 2,145 4.38% 1.22%
14 2,013 16.59% 1.15%
15 1,934 7.87% 1.10%
16 1,926 11.25% 1.10%
17 1,864 9.39% 1.06%
18 1,788 13.17% 1.02%
19 1,474 13.57% 0.84%
20 1,471 5.93% 0.84%
21 1,393 10.97% 0.80%
22 1,378 4.28% 0.79%
23 1,284 12.95% 0.73%
24 1,207 5.51% 0.69%
25 1,135 8.28% 0.65%
26 1,124 12.60% 0.64%
27 1,059 6.73% 0.60%
28 1,030 12.61% 0.59%
29 963 7.96% 0.55%
30 937 11.65% 0.54%
31 899 7.32% 0.51%
32 652 2.59% 0.37%
33 638 13.87% 0.36%
34 573 15.70% 0.33%
35 561 7.00% 0.32%
36 377 5.30% 0.22%
37 362 8.21% 0.21%
38 348 2.36% 0.20%
39 298 4.55% 0.17%
40 253 4.80% 0.14%
41 183 3.91% 0.10%
42 177 15.32% 0.10%
43 22 0.83% 0.01%
44 20 2.58% 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 county in Idaho 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 Idaho 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.