Ranking of US Counties By Population with Irish Ancestry in 2021
Updated on March 8, 2024.
Based on the US Census ACS-5Yrs estimates, in 2021, among all US counties, Cook County, IL had the highest population with Irish ancestry (447.38K), followed by Maricopa County, AZ (374.30K), and Los Angeles County, CA (364.40K).
The chart below shows the top 10 counties, and the table below shows the ranking of the top 200 counties.
You can see similar information for other ancestry groups in the US.
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Related Topics: US Census 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates (2021).
Ranking of US Counties By Population with Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Cook County, IL | 447375 |
| 2 | Maricopa County, AZ | 374304 |
| 3 | Los Angeles County, CA | 364402 |
| 4 | Middlesex County, MA | 307172 |
| 5 | Suffolk County, NY | 261574 |
| 6 | San Diego County, CA | 244282 |
| 7 | Allegheny County, PA | 210555 |
| 8 | Orange County, CA | 198632 |
| 9 | King County, WA | 197335 |
| 10 | Harris County, TX | 193716 |
| 11 | Norfolk County, MA | 179801 |
| 12 | Nassau County, NY | 179518 |
| 13 | Montgomery County, PA | 169398 |
| 14 | Philadelphia County, PA | 158209 |
| 15 | Essex County, MA | 154754 |
| 16 | Plymouth County, MA | 154557 |
| 17 | Franklin County, OH | 154540 |
| 18 | Clark County, NV | 154077 |
| 19 | Worcester County, MA | 153771 |
| 20 | Erie County, NY | 152753 |
| 21 | Cuyahoga County, OH | 148444 |
| 22 | Bucks County, PA | 147317 |
| 23 | Tarrant County, TX | 143355 |
| 24 | Oakland County, MI | 137097 |
| 25 | Riverside County, CA | 134544 |
| 26 | Delaware County, PA | 134295 |
| 27 | Hennepin County, MN | 132288 |
| 28 | Monmouth County, NJ | 131621 |
| 29 | DuPage County, IL | 131484 |
| 30 | Fairfield County, CT | 131244 |
| 31 | St. Louis County, MO | 127329 |
| 32 | New Haven County, CT | 123080 |
| 33 | Palm Beach County, FL | 122226 |
| 34 | Wayne County, MI | 121725 |
| 35 | Pinellas County, FL | 119858 |
| 36 | Ocean County, NJ | 118778 |
| 37 | Hartford County, CT | 118564 |
| 38 | New York County, NY | 117321 |
| 39 | Westchester County, NY | 116092 |
| 40 | Chester County, PA | 112331 |
| 41 | Dallas County, TX | 112035 |
| 42 | Hillsborough County, FL | 110475 |
| 43 | San Bernardino County, CA | 109621 |
| 44 | Fairfax County, VA | 109570 |
| 45 | Sacramento County, CA | 108732 |
| 46 | Monroe County, NY | 106156 |
| 47 | Kings County, NY | 102539 |
| 48 | Bergen County, NJ | 102447 |
| 49 | Wake County, NC | 101976 |
| 50 | Hamilton County, OH | 101777 |
| 51 | Broward County, FL | 101748 |
| 52 | Bristol County, MA | 101489 |
| 53 | Travis County, TX | 101192 |
| 54 | Will County, IL | 99417 |
| 55 | Suffolk County, MA | 99023 |
| 56 | Bexar County, TX | 98554 |
| 57 | Baltimore County, MD | 97384 |
| 58 | Jefferson County, KY | 95038 |
| 59 | Pierce County, WA | 93412 |
| 60 | Alameda County, CA | 92715 |
| 61 | Pima County, AZ | 92580 |
| 62 | Camden County, NJ | 90970 |
| 63 | Santa Clara County, CA | 90667 |
| 64 | Queens County, NY | 89987 |
| 65 | Morris County, NJ | 89294 |
| 66 | Contra Costa County, CA | 89102 |
| 67 | Onondaga County, NY | 89057 |
| 68 | Multnomah County, OR | 87975 |
| 69 | Hillsborough County, NH | 87216 |
| 70 | Macomb County, MI | 86474 |
| 71 | Johnson County, KS | 86120 |
| 72 | Providence County, RI | 84991 |
| 73 | Mecklenburg County, NC | 83694 |
| 74 | Burlington County, NJ | 83212 |
| 75 | Montgomery County, MD | 82873 |
| 76 | Orange County, FL | 81874 |
| 77 | Marion County, IN | 81687 |
| 78 | Lee County, FL | 80856 |
| 79 | Snohomish County, WA | 80560 |
| 80 | Brevard County, FL | 78990 |
| 81 | Anne Arundel County, MD | 78698 |
| 82 | Collin County, TX | 78640 |
| 83 | Duval County, FL | 78538 |
| 84 | New Castle County, DE | 77905 |
| 85 | Gloucester County, NJ | 77654 |
| 86 | Jackson County, MO | 77620 |
| 87 | Douglas County, NE | 77593 |
| 88 | Denton County, TX | 77122 |
| 89 | Rockingham County, NH | 76173 |
| 90 | El Paso County, CO | 75584 |
| 91 | Jefferson County, CO | 75224 |
| 92 | Lake County, IL | 74683 |
| 93 | Middlesex County, NJ | 72832 |
| 94 | Milwaukee County, WI | 72171 |
| 95 | Spokane County, WA | 71773 |
| 96 | Summit County, OH | 71642 |
| 97 | Denver County, CO | 71622 |
| 98 | Dane County, WI | 71613 |
| 99 | Pasco County, FL | 67520 |
| 100 | Salt Lake County, UT | 67321 |
| 101 | San Francisco County, CA | 65759 |
| 102 | St. Charles County, MO | 65591 |
| 103 | Arapahoe County, CO | 65298 |
| 104 | Ventura County, CA | 64838 |
| 105 | Hampden County, MA | 64673 |
| 106 | Tulsa County, OK | 64295 |
| 107 | Albany County, NY | 64098 |
| 108 | Polk County, IA | 62928 |
| 109 | Oklahoma County, OK | 62769 |
| 110 | Kent County, MI | 62514 |
| 111 | Fulton County, GA | 61872 |
| 112 | Montgomery County, OH | 60810 |
| 113 | Westmoreland County, PA | 60160 |
| 114 | Sonoma County, CA | 60029 |
| 115 | Barnstable County, MA | 59001 |
| 116 | Cobb County, GA | 58538 |
| 117 | Ramsey County, MN | 57530 |
| 118 | Cumberland County, ME | 57425 |
| 119 | Kane County, IL | 57343 |
| 120 | Luzerne County, PA | 56601 |
| 121 | Lancaster County, PA | 56452 |
| 122 | Orange County, NY | 56100 |
| 123 | Davidson County, TN | 55738 |
| 124 | Washington County, OR | 55629 |
| 125 | Saratoga County, NY | 55532 |
| 126 | Ada County, ID | 55491 |
| 127 | Dakota County, MN | 54503 |
| 128 | Montgomery County, TX | 54360 |
| 129 | Dutchess County, NY | 54297 |
| 130 | York County, PA | 54285 |
| 131 | Volusia County, FL | 53953 |
| 132 | Lackawanna County, PA | 53884 |
| 133 | Stark County, OH | 52601 |
| 134 | San Mateo County, CA | 52571 |
| 135 | Lane County, OR | 52289 |
| 136 | Clark County, WA | 52184 |
| 137 | Waukesha County, WI | 52125 |
| 138 | Sedgwick County, KS | 51248 |
| 139 | Lake County, IN | 51152 |
| 140 | Washoe County, NV | 50640 |
| 141 | McHenry County, IL | 50394 |
| 142 | Williamson County, TX | 50391 |
| 143 | Greenville County, SC | 50250 |
| 144 | Richmond County, NY | 49883 |
| 145 | Lucas County, OH | 49781 |
| 146 | Sarasota County, FL | 49713 |
| 147 | Knox County, TN | 49519 |
| 148 | Polk County, FL | 49206 |
| 149 | Virginia Beach city, VA | 49165 |
| 150 | Bernalillo County, NM | 48855 |
| 151 | Seminole County, FL | 48573 |
| 152 | Fresno County, CA | 47841 |
| 153 | Shelby County, TN | 47824 |
| 154 | Manatee County, FL | 47625 |
| 155 | New London County, CT | 46637 |
| 156 | Larimer County, CO | 46413 |
| 157 | Clackamas County, OR | 46254 |
| 158 | Lorain County, OH | 44848 |
| 159 | Butler County, OH | 44809 |
| 160 | Douglas County, CO | 44675 |
| 161 | Essex County, NJ | 44375 |
| 162 | Union County, NJ | 44247 |
| 163 | Gwinnett County, GA | 43489 |
| 164 | Atlantic County, NJ | 42763 |
| 165 | Genesee County, MI | 42321 |
| 166 | Berks County, PA | 42232 |
| 167 | Adams County, CO | 42199 |
| 168 | Kern County, CA | 41783 |
| 169 | Placer County, CA | 41742 |
| 170 | Lake County, OH | 41713 |
| 171 | Lake County, FL | 41669 |
| 172 | Hamilton County, IN | 41609 |
| 173 | San Joaquin County, CA | 41564 |
| 174 | Loudoun County, VA | 41532 |
| 175 | Hudson County, NJ | 41278 |
| 176 | Mercer County, NJ | 41227 |
| 177 | Marion County, FL | 41092 |
| 178 | Horry County, SC | 41054 |
| 179 | Jefferson County, AL | 40519 |
| 180 | Northampton County, PA | 40348 |
| 181 | Rensselaer County, NY | 40233 |
| 182 | Erie County, PA | 40107 |
| 183 | Collier County, FL | 39967 |
| 184 | Somerset County, NJ | 39726 |
| 185 | Washtenaw County, MI | 39526 |
| 186 | Charleston County, SC | 39258 |
| 187 | Boulder County, CO | 39154 |
| 188 | Honolulu County, HI | 39118 |
| 189 | Harford County, MD | 38844 |
| 190 | Kent County, RI | 38530 |
| 191 | Lehigh County, PA | 38491 |
| 192 | York County, ME | 38488 |
| 193 | Anoka County, MN | 38346 |
| 194 | Butler County, PA | 37692 |
| 195 | Sussex County, DE | 37691 |
| 196 | Frederick County, MD | 37449 |
| 197 | Hamilton County, TN | 37350 |
| 198 | Broome County, NY | 37162 |
| 199 | Rockland County, NY | 36999 |
| 200 | Prince William County, VA | 36668 |