Pennsylvania was close behind, with roughly 14.6% of its population sporting Irish ancestry. The interactive map below shows each state’s population percentage of Irish or partially Irish residents.

Pennsylvania was close behind, with roughly 14.6% of its population sporting Irish ancestry. The interactive map below shows each state’s population percentage of Irish or partially Irish residents.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.

A total of 278,528 people in New Hampshire have Irish ancestry according to the census data. That works out at 21% of the population. Maine, Rhode Island and Vermont come next in the list at 18% each.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.

As a whole, about 30.7 million U.S. residents — or slightly more than 9% — claim to be at least partially Irish, Census data shows.