See historical note at https://www.libraries.psu.edu/findingaids/1927.htm

"District 38 of the United Steelworkers of America (USWA) coordinated activities throughout the western United States from 1942 to circa 1985. During the following decade, Hawaii, Alaska, Utah, Colorado, and the Northwest remained within District 38, while California, Nevada, Arizona, and New Mexico transferred into a newly created District 39. This district of the USWA ceased operations as District 38 on June 1, 1995, when a district restructuring took effect."