Washington Occupation and Business Records

Online Records
A variety of records may be created by and about businesses that are useful to genealogists: customer accounts of local merchants, agricultural or business directories, mining claims, water rights, employment records, to mention a few.
 * 1890-1963 U.S., Northern Pacific Railway Company Personnel Files, 1890-1963 at Ancestry - index and images ($)

For gaining access to these records and deeper information, see United States Business Records.