Here is the state of unionized United States.
In 2011, the union membership rate–the percent of wage and salary workers who were members of a union–was 11.8 percent, essentially unchanged from 11.9 percent in 2010. The number of wage and salary workers belonging to unions [was] at 14.8 million… In 1983, the first year for which comparable union data are available, the union membership rate was 20.1 percent and there were 17.7 million union workers.
In 2011, 7.6 million employees in the public sector belonged to a union, compared with 7.2 million union workers in the private sector. Continue reading U is for Unions