[IrishMike]

Don’t know much about what % came through the various ports of entry, my dad came with three brothers through Ellis Island, late 40’s early 50’s. My dad in 1951.
A few months later, subway to One Whitehall Street, Manhattan - Korean War.

[Clemenza]

Ellis Island opened in 1892, long after the largest wave of Irish immigration (1840-1870). There was still significant Irish immigration up until the early 1990s, but the biggest wave was pre-Ellis Island.

The main immigration processing station in New York prior to 1892 was Castle Garden, which was near where the Staten Island Ferry terminal stands today.