It still exists.
Socialist Party of Canada was created in 1931.
Socialist Party of Canada - British Columbia - was created in 1901.
Socialist Party of Vietnam ended in 1988.
Socialist Party of Slovenia ended in 1994.
Portuguese Socialist Party ended in 1933.
Italian Socialist Party ended in 1994.
Socialist Party of Washington ended in 1972.
Sammarinese Socialist Party ended in 2005.
Socialist Union Party ended in 1941.
Pacifist Socialist Party ended in 1991.
Republican-Socialist Party ended in 1934.
Socialist Party of America ended in 1973.