Before 1906, Beaver County residents could have filed papers in any county. Consult the series catalog for specific series. Prior to 1896 declarations of intention could have been filed in the records of any of the district courts, the Supreme Court, or the Beaver County Probate Court. For other possible sources consult the Research Guide to Naturalization records. The volumes have indices at the beginning.
Entries are alphabetic by the first letter of the petitioner's surname.
The records were microfilmed in 1966 by the LDS Genealogical Society. Archival processing by A.C. Cone was completed in 1989.