Castle Garden
Pre-1892 immigration records (approximately 1820-1892). Offered free through Family Search - worth checking alongside Ellis Island for late 19th-century arrivals.
Ellis Island
Historic site in NY harbor that served as the nation's premier federal immigration station from 1892 to 1954. Contains 51+ million immigration records. Use alongside Castle Garden (FamilySearch) for 1820 - 1892 arrivals.
Mayflower History
Full Mayflower passenger list, early Plymouth Colony ship lists, genealogies, source records, and history.
