Via state.gov:

The Department relies on Locally Employed (LE) staff to support its global mission. LE Staff, which includes contractors overseas, accounts for 58 percent of the workforce. The Department’s American Government workforce, which includes career full-time FS and CS employees as well as temporary employees, constitutes approximately 31 percent of the workforce. The remaining 11 percent is composed of domestic contractors. Over the last few years, the workforce distribution has remained about the same. The State Department indicates that it employs a workforce of over 80,000 employees including contractors. 

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