At 21.9 percent, precision production, craft, and repair workers had the highest unionization rate among the broad occupational groups in 2000. Operators, fabricators, and laborers were next, at 19.8 percent.
Service occupations had a 13.2 percent union membership rate. Protective services, which includes police officers and fire fighters, had a unionization rate of 39.4 percent. For other service occupations, the rate was 8.9 percent.
Among all wage and salary workers, 13.5 percent were union members in 2000.
Bureau of Labor Statistics, U.S. Department of Labor, The Economics Daily, Union membership by occupation in 2000 at https://www.bls.gov/opub/ted/2001/jan/wk4/art02.htm (visited December 08, 2022).