US Private Sector
Trade Union Membership

Year Private Sector Union Membership Percentage of Private Sector Employees
1900 917,000 6.5%
1901 1,167,000 7.7%
1902 1,500,000 9.3%
1903 1,908,000 11.5%
1904 1,995,000 12.2%
1905 1,923,000 11.1%
1910 2,109,000 10.5%
1915 2,508,000 12.2%
1920 4,664,000 19.2%
1925 3,495,000 13.2%
1930 3,482,000 13.3%
1935 3,337,000 14.2%
1940 6,848,000 24.3%
1941 8,268,000 25.9%
1942 9,716,000 28.1%
1943 11,182,000 30.8%
1944 11,598,000 32.4%
1945 11,674,000 33.9%
1950 13,550,000 34.6%
1951 14,376,000 34.7%
1952 14,839,000 35.2%
1953 15,540,000 35.7%
1954 15,036,000 35.6%
1955 15,341,000 35.1%
1956 15,641,000 34.7%
1957 15,687,000 34.7%
1958 14,736,000 33.9%
1959 14,591,000 32.3%
1960 14,613,000 31.9%
1965 15,638,000 30.8%
1970 16,978,000 29.1%
1975 16,397,000 26.3%
1980 15,273,000 20.6%
1983 11,933,000 16.8%
1984 11,646,000 15.5%
1985 11,226,000 14.6%
1986 11,051,000 14.0%
1987 10,827,000 13.4%
1988 10,694,000 12.9%
1989 10,541,000 12.4%
1990 10,247,000 12.1%
1991 9,898,000 11.9%
1992 9,703,000 11.5%
1993 9,554,000 11.2%
1994 9,620,000 10.9%
1995 9,400,000 10.4%
1996 9,385,000 10.2%
1997 9,363,000 9.8%
1998 9,306,000 9.5%
1999 9,419,000 9.4%
2000 9,148,000 9.0%
2001 9,113,000 9.0%
2002 8,800,000 8.6%
2003 8,452,000 8.2%
2004 8,205,000 7.9%
2005 8,255,000 7.8%
2006 7,961,000 7.4%
2007 8,114,000 7.5%
2008 8,265,000 7.6%
2009 7,431,000 7.2%
2010 7,092,000 6.9%
2011 7,202,000 6.9%
2012 7,037,000 6.6%
2013 7,318,000 6.7%
2014 7,359,000 6.6%

Sources
US Department of Labor Bureau of Labor Statistics
Leo Troy & Neil Sheflin, Union Sourcebook
US Census Bureau

Revised at 201502 (Updated and data from 1950s restated)

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