2008
| Sector | Employment | Members | Covered | % Members | % Covered |
| Total | 711,461 | 37,777 | 47,893 | 5.3 | 6.7 |
| Private | 611,767 | 19,847 | 25,605 | 3.2 | 4.2 |
| Public | 99,694 | 17,931 | 22,289 | 18.0 | 22.4 |
Sources: Current Population Survey (CPS) Outgoing Rotation Group (ORG) Earnings Files, 2008. Sample includes employed wage and salary workers, ages 16 and over.
© 2009 by Barry T. Hirsch and David A. Macpherson. The use of data requires citation.
Note: Sample size for many cells are small and should be used with care.