Ellis Island – From 1892 to 1924, twenty million immigrants passed through the port of New York Ellis Island. The database is free although you do need to register.
Castle Garden – America’s first official immigration center operated from 1855 to 1890 and processed ten million immigrants through the port of New York.
Port of Baltimore – Over 2 million immigrants entered America through the port of Baltimore. Unfortunately, Baltimore does not have dedicated free search sites similar to the port of New York.
National Archives – Access to Archival Databases (AAD) has several on-line searchable databases with passenger records covering the following topics.
Immigration of Russians to the United States 1834-97
- link to Search Russians to America Passengers 1834-97 via Archive.gov (free)
- link to Search Ship Manifest Header Data 1834-97 via Archive.gov (free)
Passengers During the Irish Famine 1846-51
Immigration of Germans to the United States 1850-97
- link to Search Germans to America Passengers 1850-97 via Archive.gov (free)
- link to Search Ship Manifest Header Data 1834-1900 via Archive.gov (free)
Immigration of Italians to the United States 1855-1900
Search Panama Canal Gorgas Hospital Mortuary Register 1906-91 via Archive.gov