The searchable database covers the years 1804 to 1906 only
Learn more about the Naturalization records here.
The spelling of a single name often varies. A last name may be spelled three different ways within the same file! To get more search results you can truncate your search by using only the first or first few letters of a last name. For example, searching for "Hendricks" could yield results for "Hendricks," "Hendricksen," "Hendrickson," etc. Furthermore, searching for "Hendr" could yield results for all of the above plus "Hendreckson," "Hendrikson," etc.