Distribution of Irish People in the US

Explore the map and tables to see where people of this ethnic group have settled in the United States by county and state. Ethnic and ancestry information for these tables includes people of partial descent and is based on self identification.

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Counties by Percentage of Population: Irish

  • KEY
  • 5.15%
  • 10.3%
  • 15.45%
  • 20.6%
  • 30.9%
  • 41.2%
  • 51.5%

Percent of County
Ethnic Group Pop
County Pop

Top 20 Counties by % Population

# County Percentage
1Plymouth County, Massachusetts30.79%
2Cape May County, New Jersey29.29%
3Silver Bow County, Montana28.97%
4Gloucester County, New Jersey26.69%
5Real County, Texas26.59%
6Norfolk County, Massachusetts26.49%
7Barnstable County, Massachusetts26.41%
8Rensselaer County, New York25.3%
9Washington County, Rhode Island25.23%
10Deer Lodge County, Montana25.19%
11Kent County, Rhode Island24.91%
12Delaware County, Pennsylvania24.86%
13Lackawanna County, Pennsylvania24.67%
14Rockingham County, New Hampshire23.93%
15Pike County, Pennsylvania23.69%
16Bucks County, Pennsylvania23.68%
17Greeley County, Nebraska23.65%
18Saratoga County, New York23.56%
19Blount County, Alabama23.37%
20Newport County, Rhode Island23.24%

Top Counties by Population of Irish

# County Population
1Cook County, Illinois470,277
2Los Angeles County, California367,103
3Maricopa County, Arizona362,889
4Middlesex County, Massachusetts315,100
5Suffolk County, New York273,605
6San Diego County, California260,586
7Allegheny County, Pennsylvania224,474
8Harris County, Texas211,392
9Orange County, California209,344
10King County, Washington199,414
11Nassau County, New York187,606
12Norfolk County, Massachusetts184,957
13Montgomery County, Pennsylvania174,472
14Philadelphia County, Pennsylvania168,194
15Essex County, Massachusetts159,974
16Clark County, Nevada158,902
17Plymouth County, Massachusetts157,707
18Worcester County, Massachusetts156,842
19Cuyahoga County, Ohio153,666
20Erie County, New York153,048

Top States and Territories by Percentage

# State Percentage Population
1New Hampshire20.47%274,991
2Massachusetts20.17%1,377,769
3Rhode Island17.81%188,228
4Vermont17.03%106,443
5Maine16.76%223,315
6Pennsylvania15.89%2,032,883
7Connecticut15.32%548,561
8Delaware14.27%135,518
9West Virginia13.8%252,421
10New Jersey13.65%1,212,172
11Montana13.57%141,379
12Iowa13.13%411,302
13Ohio12.95%1,507,967
14Missouri12.63%768,876
15Nebraska12.5%238,178
16Kentucky11.75%521,594
17Kansas11.52%334,984
18Wyoming11.38%66,227
19New York11.31%2,219,416
20Illinois11.25%1,442,684
21Oregon11.2%457,003
22Colorado11.11%614,282
23Indiana10.97%728,310
24Wisconsin10.75%621,223
25Oklahoma10.45%409,333
26Washington10.41%759,440
27Michigan10.41%1,036,095
28Maryland10.22%613,305
29South Dakota10.19%88,088
30Minnesota10.16%561,530
31Arkansas10.08%301,536
32Alaska9.77%72,123
33Tennessee9.56%635,559
34Virginia9.29%781,907
35Idaho9.25%156,107
36South Carolina9.07%449,504
37Arizona8.66%601,921
38Nevada8.57%250,390
39Florida8.54%1,759,474
40Alabama8.39%408,059
41North Carolina8.25%838,165
42North Dakota7.64%57,485
43Georgia7.39%760,904
44Mississippi7.33%219,145
45Louisiana6.78%316,076
46District of Columbia6.75%46,178
47Texas6.29%1,753,958
48California6.12%2,396,639
49New Mexico5.9%123,424
50Utah5.61%170,857
51Hawaii4.33%61,557
52Puerto Rico0.03%1,036

Top States and Territories by Population of Irish

# State Population
1California2,396,639
2New York2,219,416
3Pennsylvania2,032,883
4Florida1,759,474
5Texas1,753,958
6Ohio1,507,967
7Illinois1,442,684
8Massachusetts1,377,769
9New Jersey1,212,172
10Michigan1,036,095
11North Carolina838,165
12Virginia781,907
13Missouri768,876
14Georgia760,904
15Washington759,440
16Indiana728,310
17Tennessee635,559
18Wisconsin621,223
19Colorado614,282
20Maryland613,305
21Arizona601,921
22Minnesota561,530
23Connecticut548,561
24Kentucky521,594
25Oregon457,003
26South Carolina449,504
27Iowa411,302
28Oklahoma409,333
29Alabama408,059
30Kansas334,984
31Louisiana316,076
32Arkansas301,536
33New Hampshire274,991
34West Virginia252,421
35Nevada250,390
36Nebraska238,178
37Maine223,315
38Mississippi219,145
39Rhode Island188,228
40Utah170,857
41Idaho156,107
42Montana141,379
43Delaware135,518
44New Mexico123,424
45Vermont106,443
46South Dakota88,088
47Alaska72,123
48Wyoming66,227
49Hawaii61,557
50North Dakota57,485
51District of Columbia46,178
52Puerto Rico1,036

Source Data

This data was sourced from the 2013-2018 American Communities Survey. As this is freely available government data, feel free to use and share these numbers and metrics.

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