English-language press of the Socialist Party of America

This is a list of newspapers and magazines in the United States owned by, or editorially supportive of, the Socialist Party of America (SPA, established 1901).
Also included are papers associated with the direct predecessors of the SPA — the Social Democratic Party of America with headquarters in Chicago (split from the Social Democracy of America in 1898) and the Social Democratic Party of America with headquarters in Springfield, Massachusetts (split from the Socialist Labor Party of America in 1899).
The format is: (1) Title, (2) place of publication, (3) publisher, (4) (dates).
Dates indicated are the years the papers were known to be in press and allied with the Socialist Party, not necessarily all years of publication.