Highlights from the 2020 data:
•The union membership rate of public-sector workers (34.8 percent) continued to be more than five times higher than the rate of private-sector workers (6.3 percent). (See table 3.)
•The highest unionization rates were among workers in protective service occupations (36.6 percent) and in education, training, and library occupations (35.9 percent). (See table 3.)
•Men continued to have a higher union membership rate (11.0 percent) than women (10.5 percent). (See table 1.)
•Black workers remained more likely to be union members than White, Asian, or Hispanic workers. (See table 1.)
•Nonunion workers had median weekly earnings that were 84 percent of earnings for workers who were union members ($958 versus $1,144). (The comparisons of earnings in this news release are on a broad level and do not control for many factors that can be important in explaining earnings differences.) (See table 2.)
•Among states, Hawaii and New York continued to have the highest union membership rates (23.7 percent and 22.0 percent, respectively), while South Carolina and North Carolina continued to have the lowest (2.9 percent and 3.1 percent, respectively). (See table 5.)
>Over half of the 14.3 million union members in the U.S. lived in just seven states (California, 2.4 million; New York, 1.7 million; Illinois and Pennsylvania, 0.7 million each; and Michigan, New Jersey, and Ohio, 0.6 million each). However, these states accounted for about one-third of wage and salary employment nationally.
https://www.bls.gov/news.release/pdf/union2.pdf