Petroleum County MT Immigration Records

USA (1,403,636) > Montana (10,171) > Petroleum County (57) > Petroleum County Immigration Records (1)

USA (1,403,636) > Montana (10,171) > Montana Immigration Records (192) > Petroleum County Immigration Records (1)

NOTE: Additional records that apply to Petroleum County are also on the Montana Immigration Records page.

Petroleum County Immigration Records

Montana, Federal Naturalization Records, 1870-1999 Ancestry online

Not sure what to do next in your genealogy research? Get some new ideas by using our Ancestor Source Finder tool.

Additions or corrections to this page? We welcome your suggestions through our Contact Us page

How to Use This Site Video

Montana Map

Petroleum County shown in red

Research Tip

Naturalization documents can list a person's name, age, witnesses, and place of origin. In some cases, women were not required to naturalize separately from their husbands. Before 1906 in the United States, naturalization documents sometimes only listed a home country rather than a specific town or city where a person came from. Since 1906, more detailed information has been included in naturalization documents.

Using Immigration Records

Tips for Researching Immigrants to the U.S.

Finding Your Immigrant Ancestor - Where to Start

Find Your Immigrant Ancestor - Naturalization Records

Find Your Immigrant Ancestor - Manifests and Passenger Lists