PI Buzz has a post about searching old U.S. Passport databases:
Excerpt from the PI Buzz post:
“U.S. Passport Applications 1795-1925 have been collected together into one database that can be searched by name or date and other criteria. Ancestry.com has assembled this from U.S. government sources The images of original applications may include photographs, physical descriptions, country of origin, place of residence, travel companions, marriage status and affidavits of relatives.
Search the FamilySearch.org index of international birth, death and marriage records collected by the Church of Jesus Christ of Latter-day Saints. ProGenealogists collect links to international vital records that are searchable in online databases.”