For decades, Italian Americans and Irish Americans dominated the landscape of Staten Island, at one point combining to account for nearly half of all borough residents. But while those two remain the highest-represented ethnicities in the borough, both have seen their numbers dwindle over the past decade-plus in a trend that continued in newly released data from the U.S. Census Bureau.

The Advance/SILive.com compared demographic data from the U.S. Census Bureau’s 2023 American Community Survey (ACS) 5-Year Estimates to past years, finding that tens of thousands of Italian and Irish Americans have either fled the borough or died since 2010, the first year for which ancestry data is available.