In 1921, the SNPJ merged with the Slovene Workmen's Benefit Society, or SDPZ, (which had previously absorbed the St. Barbara Lodge and the Slovene Labor Benefit and Pension Union). This merger gave the SNPJ over 36,000 members in 374 lodges. In 1941 the Slovenian Progressive Benefit Society (SSPZ) merged with the SNPJ. The Lily Alliance merged with SNPJ in 1947. Just over twenty years later, in 1969, the Slovene Independent Benefit Society merged with SNPJ. Thirty-two years after that merger, in 2001, the Workingmen's Beneficial Society of Pittsburgh merged with SNPJ.