Congress designated March as Irish-American Heritage Month in 1991 and the president issues a proclamation commemorating the occasion each year.

Originally a religious holiday to honor St. Patrick, who introduced Christianity to Ireland in the 5th century, St. Patrick’s Day has evolved into a celebration of all things Irish. The world’s first St. Patrick’s Day parade occurred on March 17, 1762, in New York City, featuring Irish soldiers who served in the English military. This parade became an annual event, with President Truman attending in 1948.

The following facts are made possible by the invaluable responses to U.S. Census Bureau surveys. We appreciate the public’s cooperation as we continuously measure America’s people, places and economy.  

438,350

The number of people living in Cook County, Ill., who claimed Irish ancestry in 2019, the largest of any county in the nation.

For more information on the Irish-American population, see the selected population profile  from the 2019 American Community Survey 1-year estimates. Statistics include:

• Sex and age.
• Marital status.
• Educational attainment.
• Veteran status.
• Employment status.
• Occupation.
• Commuting.
• Housing.
• Income

• Irish-American Heritage Month and St. Patrick’s Day: March 2020
• Irish-American Heritage Month and St. Patrick’s Day: March 2019
• Irish-American Heritage Month and St. Patrick’s Day: March 2018
• Irish-American Heritage Month and St. Patrick’s Day: March 2017

• Ancestry: 2000

• Where Irish Eyes Are Smiling in America (2020)
• Irish-American Heritage Month (2019)
• Where Irish Eyes Are Smiling (2018)
• Irish-American Heritage Month (2017)
• U.S. and Ireland Trade (Top 5 Exports and Imports) (2017)
• Where Irish Eyes Are Smiling (2016)